]> Header Protection for S/MIME American Civil Liberties Union
125 Broad St. New York, NY 10004 USA dkg@fifthhorseman.net
pEp Foundation
Oberer Graben 4 CH-8400 Winterthur Switzerland bernie.hoeneisen@pep.foundation https://pep.foundation/
Isode Ltd
14 Castle Mews Hampton, Middlesex TW12 2NP UK alexey.melnikov@isode.com
Security LAMPS Working Group Internet-Draft S/MIME version 3.1 introduced a mechanism to provide end-to-end cryptographic protection of e-mail message headers. However, few implementations generate messages using this mechanism, and several legacy implementations have revealed rendering or security issues when handling such a message. This document updates the S/MIME specification to offer a different mechanism that provides the same cryptographic protections but with fewer downsides when handled by legacy clients. Furthermore, it offers more explicit guidance for clients when generating or handling e-mail messages with cryptographic protection of message headers. The latest revision of this draft can be found at . Status information for this document may be found at . Discussion of this document takes place on the LAMPS Working Group mailing list (), which is archived at . Subscribe at . Source for this draft and an issue tracker can be found at .
Introduction Privacy and security issues regarding email Header Protection in S/MIME have been identified for some time. Most current implementations of cryptographically-protected electronic mail protect only the body of the message, which leaves significant room for attacks against otherwise-protected messages. For example, lack of header protection allows an attacker to substitute the message subject and/or author. This document describes two different structures for how message headers can be cryptographically protected, and provides guidance for implementers of MUAs that generate and interpret such messages. It takes particular care to ensure that messages interact reasonably well with legacy MUAs.
Two Schemes of Header Protection This document addresses two different schemes for cryptographically protecting email header sections or fields and provides guidance to implementers. One scheme is the form specified in S/MIME 3.1 and later, which involves wrapping a message/rfc822 or message/global MIME object with a Cryptographic Envelope around the message to protect. This document calls this scheme "Wrapped Message", and it is documented in more detail in . Experience has shown that this form does not interact well with some legacy MUAs (see ). Consequently, another form of header protection is introduced, where the protected header fields are placed directly on the Cryptographic Payload, without using an intervening message/* MIME object. This document calls this scheme "Injected Headers", and it is documented in more detail in this document, in and .
Problems with Wrapped Messages Several legacy MUAs have revealed rendering issues when dealing with a message that uses the Wrapped Message header protection scheme. In the worst cases, some mail user agents cannot render message/rfc822 message subparts at all, in violation of baseline MIME requirements as described on page 5 of . This leaves all wrapped messages unreadable by any recipient using such a MUA. In other cases, the user sees an attachment suggesting a forwarded email message, which -- in fact -- contains the protected email message that should be rendered directly. In most of these cases, the user can click on the attachment to view the protected message. However, viewing the protected message as an attachment in isolation may strip it of any security indications, leaving the user unable to assess the cryptographic properties of the message. Worse, for encrypted messages, interacting with the protected message in isolation may leak contents of the cleartext, for example, if the reply is not also encrypted.
Problems with Injected Headers A legacy MUA dealing with an encrypted message that has some header fields obscured using the Injected Headers scheme will not render the obscured header fields to the user at all. A workaround "legacy display" mechanism is provided in this document, which most legacy MUAs should render to the user, albeit not in the same location that the header fields would normally be rendered.
Motivation Users generally do not understand the distinction between message body and message header. When an e-mail message has cryptographic protections that cover the message body, but not the header fields, several attacks become possible. For example, a legacy signed message has a signature that covers the body but not the header fields. An attacker can therefore modify the header fields (including the Subject header) without invalidating the signature. Since most readers consider a message body in the context of the message's Subject header, the meaning of the message itself could change drastically (under the attacker's control) while still retaining the same cryptographic indicator of authenticity. In another example, a legacy encrypted message has its body effectively hidden from an adversary that snoops on the message. But if the header fields are not also encrypted, significant information about the message (such as the message Subject) will leak to the inspecting adversary. However, if the sending and receiving MUAs ensure that cryptographic protections cover the message headers as well as the message body, these attacks are defeated.
Backward Compatibility If the sending MUA is unwilling to generate such a fully-protected message due to the potential for rendering, usability, deliverability, or security issues, these defenses cannot be realized. The sender cannot know what MUA (or MUAs) the recipient will use to handle the message. Thus, an outbound message format that is backward-compatible with as many legacy implementations as possible is a more effective vehicle for providing the whole-message cryptographic protections described above. This document aims for backward compatibility with legacy clients to the extent possible. In some cases, like when a user-visible header like the Subject is cryptographically hidden, the message cannot behave entirely identically to a legacy client. But accommodations are described here that ensure a rough semantic equivalence for legacy clients even in these cases.
Deliverability A message that cannot be delivered is less useful than a message with perfect cryptographic protections. Senders want their messages to reach the intended recipients. Given the current state of the Internet mail ecosystem, encrypted messages in particular cannot shield all of their header fields from visibility and still be guaranteed delivery to their intended recipient. This document accounts for this concern by providing a mechanism () that prioritizes initial deliverability (at the cost of some header leakage) while facilitating future message variants that shield more header metadata from casual inspection.
Other Protocols to Protect Email Header Fields A separate pair of protocols also provides some cryptographic protection for the email message header integrity: DomainKeys Identified Mail (DKIM) , as used in combination with Domain-based Message Authentication, Reporting, and Conformance (DMARC) . This pair of protocols provides a domain-based reputation mechanism that can be used to mitigate some forms of unsolicited email (spam). However, the DKIM+DMARC suite provides cryptographic protection at a different scope than the mechanisms described here. In particular, the message integrity and authentication signals provided by DKIM+DMARC correspond to the domain name of the sending e-mail address, not the sending address itself, so DKIM+DMARC not provide end-to-end protection. DKIM+DMARC are typically applied to messages by (and interpreted by) mail transfer agents, not mail user agents. The mechanisms in this document are typically applied to messages by (and interpreted by) mail user agents. Furthermore, DKIM+DMARC only provides cryptographic integrity and authentication, not encryption. So cryptographic confidentiality is not available from that suite. DKIM+DMARC can be used on any message, including messages formed as described in this document. There should be no conflict between these schemes. Though not strictly e-mail, similar protections have been in use on Usenet for signing and verification of message headers for years. See ( and for more details. Like DKIM, these Usenet control protections offer only integrity and authentication, not encryption.
Applicability to PGP/MIME This document describes end-to-end cryptographic protections for e-mail messages in reference to S/MIME (). Comparable end-to-end cryptographic protections can also be provided by PGP/MIME (). The mechanisms in this document should be applicable in the PGP/MIME protections as well as S/MIME protections, but analysis and implementation in this document focuses on S/MIME. To the extent that any divergence from the mechanism described here is necessary for PGP/MIME, that divergence is out of scope for this document.
Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.
Terms The following terms are defined for the scope of this document: S/MIME: Secure/Multipurpose Internet Mail Extensions (see ) PGP/MIME: MIME Security with OpenPGP (see ) Message: An Email Message consisting of Header Fields (collectively called "the Header Section of the message") followed, optionally, by a Body; see . Note: To avoid ambiguity, this document avoids using the terms "Header" or "Headers" in isolation, but instead always uses "Header Field" to refer to the individual field and "Header Section" to refer to the entire collection. Header Field: A Header Field is a line beginning with a field name, followed by a colon (":"), followed by a field body (value), and terminated by CRLF; see . Header Section: The Header Section is a sequence of lines of characters with special syntax as defined in . The Header Section of a Message contains the Header Fields associated with the Message itself. The Header Section of a MIME part (that is, a subpart of a message) typically contains Header Fields associated with that particular MIME part. Body: The Body is the part of a Message that follows the Header Section and is separated from the Header Section by an empty line (i.e., a line with nothing preceding the CRLF); see . It is the (bottom) section of Message containing the payload of a Message. Typically, the Body consists of a (possibly multipart) MIME construct. Header Protection: cryptographic protection of email Header Sections (or parts of it) for signatures and/or encryption Cryptographic Layer, Cryptographic Payload, Cryptographic Envelope, Structural Headers, Main Body Part, User-Facing Headers, and MUA are all used as defined in Legacy MUA: a MUA that does not understand header protection as described in this document. A Legacy Non-Crypto MUA is incapable of doing any end-to-end cryptographic operations. A Legacy Crypto MUA is capable of doing cryptographic operations, but does not understand or generate messages with header protection. Wrapped Message: The header protection scheme that uses the mechanism described in , where the Cryptographic Payload is a message/rfc822 or message/global MIME object. (see ). Injected Headers: The header protection scheme that uses the mechanism described in this document (see ), where the protected header fields are inserted on the Cryptographic Payload directly. Header Confidentiality Policy: a functional specification of which header fields should be obscured when composing an encrypted message with header protection. See .
Document Scope This document describes sensible, simple behavior for a program that generates an e-mail message with standard end-to-end cryptographic protections, following the guidance in . An implementation conformant to this draft will produce messages that have cryptographic protection that covers the message's headers as well as its body. This document also describes sensible, simple behavior for a program that interprets such a message, in a way that can take advantage of these protections covering the header fields as well as the body. The message generation guidance aims to minimize negative interactions with any legacy receiving client while providing actionable cryptographic properties for modern receiving clients. In particular, this document focuses on two standard types of cryptographic protection that cover the entire message: A cleartext message with a single signature, and An encrypted message that contains a single cryptographic signature.
Out of Scope The message composition guidance in this document (in ) aims to provide minimal disruption for any legacy client that receives such a message. However, a legacy client by definition does not implement any of the guidance here. Therefore, the document does not attempt to provide guidance for legacy clients directly. Furthermore, this document does not explicitly contemplate unusual (and tricky) variants of cryptographic message protections, including any of these: Encrypted-only message (without a cryptographic signature) Triple-wrapped message Signed message with multiple signatures Encrypted message with a cryptographic signature outside the encryption. All such messages are out of scope of this document.
Specification As mentioned in , this document describes two ways to provide end-to-end cryptographic protection for an e-mail message that includes all header fields known to the sender at message composition time. A receiving MUA MUST be able to handle both header protection schemes, as described in . A sending MUA MUST be able to generate the Injected Headers scheme (), and MAY generate the Wrapped Message scheme ().
Injected Headers Scheme A message that uses the Injected Headers scheme has protected header fields in the header section of the Cryptographic Payload. For an encrypted message that has at least one user-visible header field omitted or obscured outside of the Cryptographic Payload, those header fields MAY also be duplicated into decorative copies in the Main Body MIME part of the Cryptograhic Payload itself. These decorative copies within the message are known as "legacy display elements". Such a legacy display element can be useful for a legacy receiving MUA that doesn't yet understand how to interpret or display a cryptographically-protected confidential header. See for more details about how the ecosystem could shift so that a sending MUA could avoid the need to generate any legacy display element. Composing a message with the Injected Headers scheme is described in . Rendering such a message is described in .
Wrapped Message Scheme A message that uses the Wrapped Message scheme has a Cryptographic payload of a single message/rfc822 (or message/global) MIME object, which itself contains the original message (including the protected header section). Composing a message with the Wrapped Message scheme is described in . Rendering such a message is described in .
Sending Side This section describes the process an MUA should use to apply cryptographic protection to an e-mail message with header protection. We start by describing the legacy message composition process as a baseline.
Composing a Cryptographically-Protected Message Without Header Protection describes the typical process for a legacy crypto MUA to apply cryptographic protections to an e-mail message. That guidance and terminology is replicated here for reference: origbody: the traditional unprotected message body as a well-formed MIME tree (possibly just a single MIME leaf part). As a well-formed MIME tree, origbody already has structural headers (Content-*) present. origheaders: the intended non-structural headers for the message, represented here as a list of (h,v) pairs, where h is a header field name and v is the associated value. Note that these are header fields that the MUA intends to be visible to the recipient of the message. In particular, if the MUA uses the Bcc header during composition, but plans to omit it from the message (see section 3.6.3 of ), it will not be in origheaders. crypto: The series of cryptographic protections to apply (for example, "sign with the secret key corresponding to X.509 certificate X, then encrypt to X.509 certificates X and Y"). This is a routine that accepts a MIME tree as input (the Cryptographic Payload), wraps the input in the appropriate Cryptographic Envelope, and returns the resultant MIME tree as output. The algorithm returns a MIME object that is ready to be injected into the mail system: Apply crypto to origbody, yielding MIME tree output For each header name and value (h,v) in origheaders: Add header h of output with value v Return output
Header Confidentiality Policy When composing an encrypted message with header protection, the composing MUA needs a Header Confidentiality Policy (HCP). In this document, we represent that Header Confidentiality Policy as a function hcp: hcp(name, val_in) → val_out: this function takes a non-structural header field identified by name with initial value val_in as arguments, and returns a replacement header value val_out. If val_out is the special value null, it mean that the header field in question should be omitted from the set of header fields visible outside the Cryptographic Envelope. Note that hcp is only applied to non-structural header fields. When composing a message, structural header fields are dealt with separately, as described in and . As an example, an MUA that obscures the Subject header field by replacing it with the literal string [...], hides all Cc'ed recipients, and does not offer confidentiality to any other header fields would be represented as (in pseudocode):
Note that such a policy is only needed when the end-to-end protections include encryption (confidentiality). No comparable policy is needed for other end-to-end cryptographic protections (integrity and authenticity), as they are simply uniformly applied so that all header fields known by the sender have these protections. This asymmetry is an unfortunate consequence of complexities in message delivery systems, some of which may reject, drop, or delay messages where all header fields are removed from the top-level MIME object. This document does not mandate any particular Header Confidentiality Policy, though it offers guidance for MUA implementers in selecting one in . Future documents may recommend or mandate such a policy for an MUA with specific needs. Such a recommendation might be motivated by descriptions of metadata-derived attacks, or stem from research about message deliverability, or describe new signalling mechanisms, but these topics are out of scope for this document.
Definition of HP-Removed and HP-Obscured header fields This document defines 2 new header fields used for conveying the effect of sender's Header Confidentiality Policy: HP-Removed and HP-Obscured. An implementation that composes encrypted e-mail and hides any of the header fields as described in this document (for example, due to a non-null HCP) MUST include the appropriate HP-Removed or HP-Obscured headers in the cryptographic payload. These two MIME header fields should only ever appear directly within the header section of the cryptographic payload of a cryptographic envelope offering confidentiality. HP-Removed includes a comma separated list of header field names that were omitted from the outer header when the message with header protection was generated. The HP-Removed header field can appear at most once in the header section of a cryptographic payload. Each instance of HP-Obscured contains a header field name and the value that this header field was modified to in the outer header. The HP-Obscured header field can appear multiple times in the header section of a cryptographic payload. If a header field name A doesn't appear in an HP-Obscured header field value, then the header field A was either removed (and thus would appear in the HP-Removed header field) or it was copied without any modifications to the outer header. Syntax of these new header fields is defined using the following ABNF :
Composing with "Injected Headers" Header Protection The "Injected Headers" header protection scheme places the header fields to be protected directly on the cryptographic payload. Unlike in the "Wrapped Scheme" (see ), there is no wrapping of the message body in any additional message/* MIME part. This section describes how to generate such a message. To compose a message using "Injected Headers" header protection, the composing MUA needs one additional input in addition to the Header Confidentiality Policy hcp defined in . legacy: a boolean value, indicating whether any recipient of the message is believed to have a legacy client. If all recipients are known to implement this draft, legacy should be set to false. (How a MUA determines the value of legacy is out of scope for this document; an initial implementation can simply set it to true) Enabling visibility of obscured header fields for decryption-capable legacy clients requires transforming a header list into a readable form and including it as a decorative "Legacy Display" element in specially-marked parts of the message. This document recommends two different mechanisms for such a decorative adjustment: one for a text/html Main Body part of the e-mail message, and one for a text/plain Main Body part. This document does not recommend adding a Legacy Display element to any other part. Please see for guidance on identifying the parts of a message that are a Main Body Part. The revised algorithm for applying cryptographic protection to a message is as follows: if crypto contains encryption, and legacy is true: Create ldlist, an empty list of (header, value) pairs For each header field name and value (h,v) in origheaders: If h is user-facing (see ): If hcp(h,v) is not v: Append (h,v) to ldlist If ldlist is not empty: Identify each leaf MIME part of payload that represents the "main body" of the message. For each "Main Body Part" bodypart of type text/plain or text/html: Insert Legacy Display element header list ldlist into the content of bodypart (see for text/plain and for text/html) Add Content-Type parameter hp-legacy-display with value 1 to bodypart For each header field name and value (h,v) in origheaders: Add header field h to MIME part payload with value v Set the protected-headers parameter on the Content-Type of payload to v1 If crypto contains encryption: Create new empty list of header field names and values newh Let hpr be an empty comma-separated list of header field names For header field name and value (h,v) in origheaders: Let newval be hcp(h,v) If newval is null: Add the value h to hpr Else (if newval is not null): Add (h,newval) to newh If newval is not v: Let string record be the concatenation of h, a literal ": " (colon followed by space), and newval Add header field "HP-Obscured" to MIME part payload with value record If hpr is not empty: Add header field "HP-Removed" to MIME part payload with value hpr Set origheaders to newh Apply crypto to payload, producing MIME tree output For each header field name and value (h,v) in origheaders: Add header field h to output with value v Return output Note that both new parameters (hcp and legacy) are effectively ignored if crypto does not contain encryption. This is by design, because they are irrelevant for signed-only cryptographic protections.
Adding a Legacy Display Element to a text/plain Part For a list of obscured header fields represented as (header, value) pairs, concatenate them as a set of lines, with one newline at the end of each pair. Add an additional trailing newline after the resultant text, and prepend the entire list to the body of the text/plain part. For example, if the list of obscured header fields was [("Cc", "alice@example.net"), ("Subject", "Thursday's meeting")], then a text/plain part that originally contained:
Would become:
Adding a Legacy Display Element to a text/html Part Adding a Legacy Display Element to a text/html part is similar to how it is added to a text/plain part (see ). Instead of adding the obscured header fields to a block of text delimited by a blank line, the composing MUA injects them in an HTML <div> element annotated with a class attribute of header-protection-legacy-display. The content and formatting of this decorative <div> have no strict requirements, but they SHOULD represent all the obscured header fields in a readable fashion. A simple approach is to assemble the text in the same way as , wrap it in a verbatim <pre> element, and put that element in the annotated <div>. The annotated <div> should be placed as close to the start of the <body> as possible, where it will be visible when viewed with a standard HTML renderer. For example, if the list of obscured header fields was [("Cc", "alice@example.net"), ("Subject", "Thursday's meeting")], then a text/html part that originally contained:

I think we should skip the meeting.

]]>
Would become: 
Subject: Thursday's meeting
Cc: alice@example.net

I think we should skip the meeting.

]]>
Step-by-step Example for Inserting Legacy Display Element to text/html A composing MUA MAY insert the Legacy Display Element anywhere reasonable within the message as long as it prioritizes visibility for the reader using a legacy decryption-capable MUA. This decision may take into account special message-specific HTML formatting expectations if the MUA is aware of them. However, some MUAs may not have any special insight into the user's preferred HTML formatting, and still want to insert a legacy display element. This section offers a non-normative, simple, and minimal step-by-step approach for a composing MUA that has no other information or preferences to fall back on. The process below assumes that the MUA already has the full HTML object that it intends to send, including all of the text supplied by the user. Assemble the text exactly as specified for text/plain (see ). Wrap that text in a verbatim <pre> element. Wrap that <pre> element in a <div> element annotated with the class header-protection-legacy-display. Find the <body> element of the full HTML object. Insert the <div> element as the first child of the <body> element.
Only Add a Legacy Display Element to Main Body Parts Some messages may contain a text/plain or text/html subpart that is not a main body part. For example, an e-mail message might contain an attached text file or a downloaded webpage. Attached documents need to be preserved as intended in the transmission, without modification. The composing MUA MUST NOT add a Legacy Display element to any part of the message that is not a main body part. In particular, if a part is annotated with Content-Disposition: attachment, or if it does not descend via the first child of any of its multipart/mixed or multipart/related ancestors, it is not a main body part, and MUST NOT be modified. See for more guidance about common ways to distinguish main body parts from other MIME parts in a message.
Do Not Add a Legacy Display Element to Other Content-Types The purpose of injecting a Legacy Display element into each Main Body MIME part is to enable rendering of otherwise obscured header fields in legacy clients that are capable of message decryption, but don't know how to follow the rest of the guidance in this document. The authors are unaware of any legacy client that would render any MIME part type other than text/plain and text/html as the Main Body. A generating MUA SHOULD NOT add a Legacy Display element to any MIME part with any other Content-Type.
Composing with "Wrapped Message" Header Protection The Wrapped Message header protection scheme is briefly documented in Section 3.1 . This section provides a more detailed explanation of how to build such a message, and augments it with the protected-headers parameter with the value wrapped. It also recommends marking such a wrapped message as Content-Disposition: inline to encourage legacy MUAs to render the inner message directly rather than treating it as an attachment. To compose a message using "Wrapped Message" header protection, we use those inputs described in plus the Header Confidentiality Policy hcp defined in . The new algorithm is: For header field name and value (h,v) in origheaders: Add header field h to origbody with value v If crypto contains encryption: Create new empty list of header field names and values newh Let hpr be an empty comma-separated list of header field names For header field name and value (h,v) in origheaders: Let newval be hcp(h,v) If newval is null: Add the value h to hpr Else (if newval is not null): Append (h,newval) to newh If newval is not v: Let string record be the concatenation of h, a literal ": " (colon followed by a space), and newval Add header field HP-Obscured to origbody with value record If hpr is not empty: Add header field "HP-Removed" to MIME part payload with value hpr If any of the header fields in origbody, including header fields in the nested internal MIME structure, contain any 8-bit UTF-8 characters (see section section 3.7 of ): Let payload be a new MIME part with one header field: Content-Type: message/global; protected-headers=wrapped, and whose body is origbody. Else: Let payload be a new MIME part with one header field: Content-Type: message/rfc822; protected-headers=wrapped, and whose body is origbody. Add a Content-Disposition header field to payload with value inline Apply crypto to payload, yielding MIME tree output If crypto contains encryption: Set origheaders to newh For header field name and value (h,v) in origheaders: Add header field h to output with value v Return output Note that the Header Confidentiality Policy hcp is ignored if crypto does not contain encryption. This is by design.
Choosing Between Wrapped Message and Injected Headers When composing a message with end-to-end cryptographic protections, an MUA SHOULD protect the header fields of that message as well as the body, using one of the formats described here. A compatible MUA MUST be capable of generating a message with header protection using the Injected Headers format.
Default Header Confidentiality Policy An MUA SHOULD have a sensible default Header Confidentiality Policy, and SHOULD NOT require the user to select one. At the time this document was written, a good choice for default HCP is the conservative approach described by hcp_minimal (). Any default Header Confidentiality Policy SHOULD provide confidentiality for the Subject header field by replacing it with the literal string [...]. Most users treat the Subject of a message the same way that they treat the body, and they are surprised to find that the Subject of an encrypted message is visible.
Minimalist Header Confidentiality Policy The most conservative recommended Header Confidentiality Policy only protects the Subject header field:
hcp_minimal is the recommended default HCP for a new implementation, as it provides meaningful confidentiality protections, and is unlikely to cause deliverability or usability problems.
Strong Header Confidentiality Policy Alternately, a more aggressive (and therefore more privacy-preserving) Header Confidentiality Policy only leaks a handful of fields whose absence is known to increase rates of delivery failure, and simultaneously obscures the Message-ID behind a random new one:
The function generate_new_message_id() represents whatever process the MUA typically uses to generate a Message-ID for a new outbound message. hcp_strong is known to cause usability problems with message threading for many legacy MUAs, and is not recommended as a default HCP for new implementations.
Null Header Confidentiality Policy Legacy MUAs can be conceptualized as offering a null Header Confidentiality Policy, which offers no confidentiality protection to any header field:
A MUA offering header protection SHOULD NOT use hcp_null by default.
Offering Stronger Header Confidentiality A MUA MAY offer even stronger confidentiality for header fields of an encrypted message than described in . For example, it might implement an HCP that obfuscates the From field, or omits the Cc field, or ensures Date is represented in UTC (obscuring the local timezone). The authors of this document hope that implementers with deployment experience will document their chosen Header Confidentiality Policy and the rationale behind their choice.
Receiving Side An MUA that receives a cryptographically-protected e-mail will render it for the user. The receiving MUA will render the message body, a selected subset of header fields, and (as described in ) provide a summary of the cryptographic properties of the message. Most MUAs only render a subset of header fields by default. For example, few MUAs typically render Message-Id or Received header fields for the user, but most do render From, To, Cc, Date, and Subject. A MUA that knows how to handle a message with header protection makes the following two changes to its behavior when rendering a message: If it detects that an incoming message had protected header fields, it renders header fields for the message from the protected header fields, ignoring the external (unprotected) header fields. It includes information in the message's cryptographic summary to indicate the types of protection that applied to each rendered header field (if any). A MUA that handles a message with header protection does not need to render any new header fields that it did not render before.
Identifying that a Message has Header Protection An incoming message can be identified as having header protection based on one of two signals: The Cryptographic Payload has Content-Type: message/rfc822 or Content-Type: message/global and the parameter protected-headers has a value of wrapped. See for rendering guidance. The Cryptographic Payload has some other Content-Type and it has parameter protected-headers set to v1. See for rendering guidance. Messages of both types exist in the wild, and a compliant MUA MUST be able to handle them both. They provide the same semantics and the same meaning.
Updating the Cryptographic Summary Regardless of whether a cryptographically-protected message has protected header fields, the cryptographic summary of the message should be modified to indicate what protections the header fields have. Each header field individually has exactly one the following protections: unprotected (this is the case for all header fields in messages that have no header protection) signed-only (bound into the same validated signature as the enclosing message, but also visible in transit) encrypted-only (only appears within the cryptographic payload; the corresponding external header field was either omitted or obfuscated) signed-and-encrypted (same as encrypted-only, but additionally is under a validated signature) Note that while the message itself may be signed-and-encrypted, some header fields may be replicated on the outside of the message (e.g. Date). Those header fields would be signed-only, despite the message itself being signed-and-encrypted. Additionally, the data from some encrypted or signed-and-encrypted header fields may not be fully private (see for more details). Rendering the cryptographic status of each header field is likely to be complex and messy --- users may not understand it. It is beyond the scope of this document to suggest any specific graphical affordances or user experience. Future work should include examples of successful rendering of this information.
Rendering a Message with Injected Headers When the Cryptographic Payload does not have a Content-Type of message/rfc822 or message/global, and the parameter protected-headers is set to v1, the values of the protected header fields are drawn from the header fields of the Cryptographic Payload, and the body that is rendered is the Cryptographic Payload itself.
Example Signed-only Message with Injected Headers
The message body should be rendered the same way as this message:
It should render header fields taken from part B. Its cryptographic summary should indicate that the message was signed and all rendered header fields were included in the signature. The MUA SHOULD ignore header fields from part A for the purposes of rendering.
Example Signed-and-Encrypted Message with Injected Headers Consider a message with this structure, where the MUA is able to validate the cryptographic signature:
The message body should be rendered the same way as this message:
It should render header fields taken from part G. Its cryptographic summary should indicate that the message was signed and encrypted. Each rendered header field found in G should be considered against any HP-Removed header field found in G and all HP-Obscured header fields found in G. If the field's name is found in the list of header field names in HP-Removed, or if one of the HP-Obscured fields refers to the field name, then the header field should be marked as signed-and-encrypted. Otherwise, the header field should be marked as signed-only.
Do Not Render Legacy Display Elements As described in , a message with cryptographic confidentiality protection MAY include "Legacy Display" elements for backward-compatibility with legacy MUAs. These Legacy Display elements are strictly decorative, unambiguously identifiable, and will be discarded by compliant implementations. The receiving MUA SHOULD avoid rendering the identified Legacy Display elements to the user at all, since it is aware of header protection and can render the actual protected header fields. If a text/html or text/plain part within the cryptographic envelope is identified as containing Legacy Display elements, those elements SHOULD be hidden when rendering and SHOULD be dropped when generating a draft reply or inline forwarded message. Whenever a Message or MIME subtree is exported, downloaded or otherwise further processed, implementers should consider whether or not to drop the Legacy Display elements.
Identifying a Part with Legacy Display Elements A receiving MUA acting on a message that contains an encrypting Cryptographic Layer identifies a MIME subpart with within the Cryptographic Payload as containing Legacy Display elements based on the Content-Type of the subpart. The subpart's Content-Type contains a parameter hp-legacy-display with value set to 1 The subpart's Content-Type is either text/html (see ) or text/plain (see ) Note that the term "subpart" above is used in the general sense: if the Cryptographic Payload is a single part, that part itself may contain a Legacy Display element if it is marked with the hp-legacy-display=1 parameter.
Omitting Legacy Display Elements from text/plain If a text/plain part within the Cryptographic Payload has the Content-Type parameter hp-legacy-display="1", it should be processed before rendering in the following fashion: Discard the leading lines of the body of the part up to and including the first entirely blank line. Note that implementing this strategy is dependent on the charset used by the MIME part. See for an example.
Omitting Legacy Display Elements from text/html If a text/html part within the Cryptographic Payload has the Content-Type parameter hp-legacy-display="1", it should be processed before rendering in the following fashion: If any element of the HTML <body> is a <div> with class attribute header-protection-legacy-display, that entire element should be omitted. A straightforward way for an HTML-capable MUA to do this is to add an entry to the stylesheet for such a part:
Rendering a Wrapped Message Some MUAs may compose and send a message with end-to-end cryptographic protections that offer header protection using the Wrapped Message scheme described in Section 3.1 of . This section describes how a receiving MUA should identify and render such a message. When the Cryptographic Payload has Content-Type of message/rfc822 or message/global, and the parameter protected-headers is set to wrapped, the values of the protected header fields are drawn from the header fields of the Cryptographic Payload, and the body that is rendered is the body of the Cryptographic Payload.
Example Signed-Only Wrapped Message Consider a message with this structure, where the MUA is able to validate the cryptographic signature:
The message body should be rendered the same way as this message:
It should render header fields taken from part K. Its cryptographic summary should indicate that the message was signed and all rendered header fields were included in the signature. The MUA SHOULD ignore header fields from part J for the purposes of rendering.
Example Signed-and-Encrypted Wrapped Message Consider a message with this structure, where the MUA is able to validate the cryptographic signature:
The message body should be rendered the same way as this message:
It should render header fields taken from part Q. Its cryptographic summary should indicate that the message was signed and encrypted. As in , each rendered header field found in Q should be considered against any HP-Removed header field found in Q and all HP-Obscured header fields found in Q. If the field's name is found in the list of header field names in HP-Removed, or if one of the HP-Obscured fields refers to the field name, then the header field should be marked as signed-and-encrypted. Otherwise, the header field should be marked as signed-only.
Guidance for Automated Message Handling Some automated systems have a control channel that is operated by e-mail. For example, an incoming e-mail message could subscribe someone to a mailing list, initiate the purchase of a specific product, approve another message for redistribution, or adjust the state of some shared object. To the extent that such a system depends on end-to-end cryptographic guarantees about the e-mail control message, header protection as described in this document should improve the system's security. This section provides some specific guidance for systems that use e-mail messages as a control channel that want to benefit from these security improvements.
Interpret Only Protected Header Fields Consider the situation where an e-mail-based control channel depends on the message's cryptographic signature and the action taken depends on some header field of the message. In this case, the automated system MUST rely on information from the header field that is protected by the mechanism described in this document. It MUST NOT rely on any header field found outside the cryptographic payload. For example, consider an administrative interface for a mailing list manager that only accepts control messages that are signed by one of its administrators. When an inbound message for the list arrives, it is queued (waiting for administrative approval) and the system generates and listens for two distinct e-mail addresses related to the queued message -- one that approves the message, and one that rejects it. If an administrator sends a signed control message to the approval address, the mailing list verifies that the protected To: header field of the signed control message contains the approval address before approving the queued message for redistribution. If the protected To: header field does not contain that address, or there is no protected To: header field, then the mailing list logs or reports the error, and does not act on that control message.
Ignore Legacy Display Elements Consider the situation where an e-mail based control channel expects to receive an end-to-end encrypted message -- for example, where the control messages need confidentiality guarantees -- and where the action taken depends on the contents of some MIME part within message body. In this case, the automated system that decrypts the incoming mssages and scans the relevant MIME part SHOULD identify when the MIME part contains a legacy display element (see ), and it SHOULD parse the relevant MIME part with the legacy display element removed. For example, consider an administrative interface of a confidential issue tracking software. An authorized user can confidentially adjust the status of a tracked issue by a specially-formatted first line of the message body (for example, severity #183 serious). When the user's MUA encrypts a plain text control message to this issue tracker, depending on the MUA's HCP and its choice of legacy value, it may add a legacy display element. If it does so, then the first line of the message body will contain a decorative copy of the confidential Subject: header field. The issue tracking software decrypts the incoming control message, identifies that there is a legacy display element in the part (see ), strips the legacy display lines (including the first blank line), and only then parses the remaining top line to look for the expected special formatting.
Affordances for Debugging and Troubleshooting Note that advanced users of an MUA may need access to the original message, for example to troubleshoot problems with the rendering MUA itself, or problems with the SMTP transport path taken by the message. A MUA that applies these rendering guidelines SHOULD ensure that the full original source of the message as it was received remains available to such a user for debugging and troubleshooting. If a troubleshooting scenario demands information about the cryptographically-protected values of headers, and the message is encrypted, the debugging interface SHOULD also provide a "source" view of the Cryptographic Payload itself, alongside the full original source of the message as received.
Rendering Other Schemes Other MUAs may have generated different structures of messages that aim to offer end-to-end cryptographic protections that include header protection. While this document is not normative for those schemes, it offers guidance for how to identify and handle these other formats. In the following a list of systems that are known to generate email messages with end-to-end cryptographic protections that include header protection using a different MIME scheme.
Pretty Easy Privacy (pEp) The pEp (pretty Easy privacy) project specifies MIME schemes for Signed-and-Encrypted email messages that also provide header protection . Similar to the "Wrapped Messages" scheme described in and , pEp email messages are fully encapsulated in the Cryptographic Payload. More information can be found in .
Composing a Reply to an Encrypted Message with Header Protection When composing a reply to an encrypted message with header protection, the MUA is acting both as a receiving MUA and as a sending MUA. Special guidance applies here, as things can go wrong in at least two ways: leaking previously-confidential information, and replying to the wrong party.
Avoid Leaking Encrypted Header Fields in Reply As noted in , an MUA in this position MUST NOT leak previously-encrypted content in the clear in a followup message. The same is true for protected header fields. Values from any header field that was identified as either encrypted-only or signed-and-encrypted based on the steps outlined above MUST NOT be placed in cleartext output when generating a message. In particular, if Subject was encrypted, and it is copied into the draft encrypted reply, the replying MUA MUST obfuscate the unprotected (cleartext) Subject header field as described above. When crafting the headers for a reply message, the composing MUA can make use of the HP-Removed and HP-Obscured headers from within the cryptographic envelope of the reference message to ensure that headers derived from the reference message do not leak in the reply. Consider a header field in a reply message that is generated by derivation from a header field in the reference message. For example, the To header field is typically derived from the reference message's Reply-To or From header fields. When generating the outer copy of the header field, the composing MUA first applies its own header confidentiality policy. If the header field's value is changed by the HCP, then it is applied to the outside header and noted in the protected header section using HP-Removed or HP-Obscured as appropriate, as described in . Otherwise, if the header field's value is unchanged, the composing MUA re-generates the header field using the source header fields from the values within the cryptographic payload of the reference message, as modified by the HP-Obscured or HP-Removed headers. If that value is itself different than the protected value, then it is applied to the outside header and noted in the protected header section using HP-Obscured. If the value is the same as the protected value, then it is simply copied to the outside header directly. See for a simple worked example of this process.
Avoid Misdirected Replies to Encrypted Messages with Header Protection When replying to a message, the Composing MUA typically decides who to send the reply to based on: the Reply-To, Mail-Followup-To, or From header fields optionally, the other To or Cc header fields (if the user chose to "reply all") When a message has header protection, the replying MUA MUST populate the destination fields of the draft message using the protected header fields, and ignore any unprotected header fields. This mitigates against an attack where Mallory gets a copy of an encrypted message from Alice to Bob, and then replays the message to Bob with an additional Cc to Mallory's own e-mail address in the message's outer (unprotected) header section. If Bob knows Mallory's certificate already, and he replies to such a message without following the guidance in this section, it's likely that his MUA will encrypt the cleartext of the message directly to Mallory.
Implicitly-rendered Header Fields While From and To and Cc and Subject and Date are often explicitly rendered to the user, some header fields do affect message display, without being explicitly rendered. For example, Message-Id, References, and In-Reply-To header fields may collectively be used to place a message in a "thread" or series of messages. In another example, observes that the value of the Reply-To field can influence the draft reply message. So while the user may never see the Reply-To header field directly, it is implicitly "rendered" when the user interacts with the message by replying to it. An MUA that depends on any implicitly-rendered header field in a message with header protection SHOULD use the value from the protected header field, and SHOULD NOT use any value found outside the cryptographic protection.
Unprotected Header Fields Added in Transit Some header fields are legitimately added in transit, and could not have been known to the sender at message composition time. The most common of these header fields are Received and DKIM-Signature, neither of which are typically rendered, either explicitly or implicitly. If a receiving MUA has specific knowledge about a given header field, including that: the header field would not have been known to the original sender, and the header field might be rendered explicitly or implicitly, then the MUA MAY decide to operate on the value of that header field from the unprotected header section, even though the message has header protection. The MUA MAY prefer to verify that the header fields in question have additional transit-derived cryptographic protections (e.g., to test whether they are covered by a valid DKIM-Signature, see ) before rendering or acting on them. Specific examples appear below.
Mailing list header fields: List-* and Archived-At If the message arrives through a mailing list, the list manager itself may inject header fields (most of which start with List-) in the message: List-Archive List-Subscribe List-Unsubscribe List-Id List-Help List-Post Archived-At For some MUAs, these header fields are implicitly rendered, by providing buttons for actions like "Subscribe", "View Archived Version", "Reply List", "List Info", etc. An MUA that receives a message with header protection that contains these header fields in the unprotected section, and that has reason to believe the message is coming through a mailing list MAY decide to render them to the user (explicitly or implicitly) even though they are not protected.
E-mail Ecosystem Evolution This document is intended to offer tooling needed to improve the state of the e-mail ecosystem in a way that can be deployed without significant disruption. Some elements of this specification are present for transitional purposes, but would not exist if the system were designed from scratch. This section describes these transitional mechanisms, as well as some suggestions for how they might eventually be phased out.
Dropping Legacy Display Elements Any decorative Legacy Display element added to an encrypted message that uses the Injected Header scheme is present strictly for enabling header field visibility (most importantly, the Subject header field) when the message is viewed with a decryption-capable legacy client. Eventually, the hope is that most decryption-capable MUAs will conform to this specification, and there will be no need for injection of Legacy Display elements in the message body. A survey of widely-used decryption-capable MUAs might be able to establish when most of them do support this specification. At that point, a composing MUA could make the legacy parameter described in {#compose-injected-headers} to false by default, or could even hard-code it to false, yielding a much simpler message construction set. Until that point, an end user might want to signal that their receiving MUAs are conformant to this draft so that a peer composing a message to them can set legacy to false. A signal indicating capability of handling messages with header protection might be placed in the user's cryptographic certificate, or in outbound messages. This draft doesn't attempt to define the syntax or semantics of such a signal.
Stronger Default Header Confidentiality Policy This draft defines two different forms of Header Confidentiality Policy. A MUA implementing an HCP for the first time SHOULD deploy hcp_minimal as recommended in . This HCP offers the most commonly-expected protection (obscuring the Subject header field) without risking deliverability or rendering issues. The HCPs proposed in this draft are relatively conservative and still leak a significant amount of metadata for encrypted messages. This is largely done to ensure deliverability (see ) and usability, as messages without some critical header fields are more likely to not reach their intended recipient. In the future, some mail transport systems may accept and deliver messages with even less publicly-visible metadata. Many MTA operators today would ask for additional guarantees about such a message to limit the risks associated with abusive or spammy mail. This specification offers the HCP formalism itself as a way for MUA developers and MTA operators to describe their expectations around message deliverability. MUA developers can propose a stronger default HCP, and ask MTA operators (or simply test) whether their MTAs would be likely to deliver or reject encrypted mail with that HCP applied. Proponents of a stronger HCP should explicitly document the HCP, and name it clearly and unambiguously to facilitate this kind of interoperability discussion. Reaching widespread consensus around a stronger global default HCP is a challenging problem of coordinating many different actors. A piecemeal approach might be more feasible, where some signalling mechanism allows a message recipient, MTA operator, or third-party clearinghouse to announce what kinds of HCPs are likely to be deliverable for a given recipient. In such a situation, the default HCP for a MUA might involve consulting the signalled acceptable HCPs for all recipients, and combining them (along with a default for when no signal is present) in some way. If such a signal were to reach widespread use, it could also be used to guide reasonable statistical default HCP choices for recipients with no signal. This draft doesn't attempt to define the syntax or semantics of such a signal.
Deprecation of Messages Without Header Protection At some point, when the majority of MUA clients that can generate cryptographically protected messages with header protection, it should be possible to deprecate any cryptographically protected message that does not have header protection. For example, as noted in , it's possible for a MUA to decline to render a signed-only message that has no header protection the same as an unsigned message. And a signed-and-encrypted message without header protection could likewise be marked as not fully protected. These stricter rules could be adopted immediately for all messages. Or a MUA developer could roll them out immediately for any new message, but still treat an old message (based on the Date header field and cryptographic signature timestamp) more leniently. A decision like this by any popular receiving MUA could drive adoption of this standard for sending MUAs.
Usability Considerations This section describes concerns for MUAs that are interested in easy adoption of header protection by normal users. While they are not protocol-level artifacts, these concerns motivate the protocol features described in this document. See also the Usability section in .
Mixed Protections Within a Message Are Hard To Understand When rendering a message to the user, the ideal circumstance is to present a single cryptographic status for any given message. However, when message headers are present, some message headers do not have the same cryptographic protections as the main message. Representing such a mixed set of protection statuses is very difficult to do in a way that a normal user can understand without training. There are at least three scenarios that are likely to be common, and poorly understood: A signed message with no header protection. A signed-and-encrypted message with no header protection. An signed-and-encrypted message with header protection as described in this document, where some user-facing headers have confidentiality but some do not. A MUA should have a reasonable strategy for clearly communicating each of these scenarios to the user. For example, a MUA operating in an environment where it expects most cryptographically-protected messages to have header protection could use the following rendering strategy: When rendering a message with signed-only cryptographic status but no header protection, decline to indicate to the user that the message was signed at all. That is, the message would appear identical to an unsigned message. When rendering a message with signed-and-encrypted or encrypted-only cryptographic status but no header protection, overlay a warning flag on the typical cryptographic status indicator. That is, if a typical signed-and-encrypted message displays a lock icon, display a lock icon with a warning sign (e.g., an exclamation point in a triangle) overlaid. See, for example, the graphics in . When rendering a message with signed-and-encrypted or encrypted-only cryptographic status, with header protection, but where the Subject header field has not been removed or obscured, place a warning sign on the on the Subject line. Other simple rendering strategies could also be reasonable.
Users Should Not Have To Choose a Header Confidentiality Policy This document defines the abstraction of a Header Confidentiality Policy object for the sake of communication between implementers and deployments. Most e-mail users are unlikely to understand the tradeoffs between different policies. In particular, the potential negative side effects (e.g. poor deliverability) may not be easily attributable by a normal user to a particular HCP. Therefore, MUA implementers should be conservative in their choice of default HCP, and should not require the ordinary user to make an incomprehensible choice that could cause unfixable, undiagnosable problems. The safest option is for the MUA developer to select a known, stable HCP (this document recommends hcp_minimal in ) on the user's behalf. A MUA should not not expose the ordinary user to a configuration option where they are expected to manually select (let alone define) an HCP. In the event that a MUA implementer gets user complaints about problems with removed or obscured header fields due to the MUA's defined HCP, the implementer may offer the user an option to drop header confidentiality altogether for freshly composed messages (thereby reverting to hcp_null). But when handling such a scenario for a reply to a message with some header confidentiality policy in place, note the guidance in to avoid accidental leakage.
Users Should Not Have To Choose a Header Protection Scheme This document also describes two different header protection schemes: Wrapped Messages in and Injected Headers in . These distinct schemes are described for the sake of implementers who may have to deal with messages found in the wild, but their intended semantics are identical. They represent different tradeoffs in terms of rendering and user experience on the recipient's side, things that a given user writing a message is not prepared to select. When composing a message with cryptographic protections, the ordinary user should not be confronted with any choices about which header protection scheme to use. Rather, the MUA developer should use a single scheme for all outboud cryptographically-protected messages. This document recommends the Injected Headers scheme for generating messages with cryptographic protections, as described in . A MUA should not expose the ordinary user to any configuration option where they are expected to manually select, enable, or disable header protections for new cryptographically-protected messages.
Security Considerations This document describes a mechanism for improving the security of cryptographically-protected e-mail messages. Following the guidance in this document should improve security for users of these technologies by more directly aligning the underlying messages with user expectations about confidentiality, authenticity, and integrity. However, many existing messages with cryptographic protections will not have these protections, and MUAs encountering these messages will need to handle older forms (without header protection) for quite some time. An implementation that deals with legacy message archives will need to deal with all the various formats forever. Helping the user distinguish between cryptographic protections of various messages is a difficult job for message renderers. However, on the message generation side, the situation is much clearer: there is a standard form that a protected message can take, and an implementer can always generate the standard form. Generating the standard form also makes it more likely that any receiving implementation will be able to handle the generated message appropriately.
Caution about Composing with Legacy Display Elements When composing a message, it's possible for a Legacy Display Element to contain risky data that a rendering client could trigger errors in a rendering client. For example, if the value for a header field to be included in a Legacy Display Element within a given body part contains folding whitespace, it should be "unfolded" before generating the Legacy Display Element: all contiguous folding whitespace should be replaced with a single space character. Likewise, if the header value was originally encoded with , it should be decoded first to a standard string and re-encoded using the charset appropriate to the target part. When including a Legacy Display Element in a text/plain part (see ), if the decoded Subject header field contains a pair of newlines (e.g., if it is broken across multiple lines by encoded newlines), any newline MUST be stripped from the Legacy Display Element. If the pair of newlines is not stripped, a receiving MUA that follows the guidance in might leave the later part of the Legacy Display Element in the rendered message. When including a Legacy Display Element in a text/html part (see ), any material in the header values should be explicitly HTML escaped to avoid being rendered as part of the HTML. At a minimum, the characters <, >, and & should be escaped to &lt;, &gt;, and &amp;, respectively (see for example ). If unescaped characters from removed or obscured header values end up in the Legacy Display element, a receiving MUA that follows the guidance in might fail to identify the boundaries of the Legacy Display Element, cutting out more than it should, or leaving remnants visible. And a legacy client parsing such a message might misrender the entire HTML stream, depending on the content of the removed or obscured header values. The Legacy Display Element is a decorative addition solely to enable visibility of obscured or removed header fields in legacy, decryption-capable MUAs. When it is produced, it should be generated conservatively and narrowly, to avoid damaging the rest of the message.
Privacy Considerations
Encrypted Header Fields Are Not Always Private For encrypted messages, depending on the sender's HCP, some header fields may appear both within the Cryptographic Envelope and on the outside of the message. identifies those messages as signed-only. These header fields are clearly not private at all, despite a copy being inside the Cryptographic Envelope. A header field whose name can be found in the HP-Removed or in any HP-Obscured header field from the same part will have encrypted-only or signed-and-encrypted status. But even header fields with these stronger levels of cryptographic confidentiality protection might not be as private as the user would like.
Header Fields Can Leak Unwanted Information to the Recipient For encrypted messages, even with a powerful HCP that successfully obscures most header fields from all transport agents, header fields will be ultimately visible to all intended recipients. This can be especially problematic for header fields that are not user-facing, which the sender may not expect to be injected by their MUA. Consider the three following examples: The MUA may inject a User-Agent header field that describes itself to every recipient, even though the sender may not want the recipient to know the exact version of their OS, hardware platform, or MUA. The MUA may have an idiosyncratic way of generating a Message-ID header, which could embed the choice of MUA, a timezone, a hostname, or other subtle information to a knowledgable recipient. The MUA may erroneously include a Bcc header field in the origheaders of a copy of a message sent to the named recipient, defeating the purpose of using Bcc instead of Cc (see for more details about risks related to Bcc). Clearly, no end-to-end cryptographic protection of any header field as described in this document will hide such a sensitive field from the intended recipient. Instead, the composing MUA MUST judiciously populate the origheaders list for any outbound message with only information that the user reasonably intends the recipient to have access to. This is true for messages without any cryptographic protection as well, of course, and it is even worse there: such a leak is exposed to the transport agents as well as the recipient. An encrypted message with header protection and a strong header confidentiality policy avoid these leaks exposing information to the transport agents, but cannot defend against such a leak to the recipient.
Encrypted Header Fields Can Be Inferred From External Metadata For example, if the To: and Cc: header fields are omitted from the unprotected header section, the values in those fields might still be inferred with high probability by an adversary who looks at the message either in transit or at rest. If the message is found in, or being delivered to a mailbox for bob@example.org, it's likely that Bob was in either To: or Cc:. Additionally, an MTA that handles the message may add a Received: header field (or some other custom header field) that leaks some information about the nature of the delivery.
HCP May Not Mask All Data in an Encrypted Header Field In another example, if the HCP modifies the Date: header to mask out high-resolution time stamps (e.g. rounding to the most recent hour) and to convert the local timezone to UTC, some information about the date of delivery will still be attached to the e-mail. At the very least, the low resolution, global version of the date will be present on the message. Additionally, headers like Received that are added during message delivery might include higher-resolution timestamps. And if the message lands in a mailbox that is ordered by time of receipt, even its placement in the mailbox and the non-obscured Date: header fields of the surrounding messages could leak this information. Some fields like From: may be impossible to fully obscure, as many modern message delivery systems depend on at least domain information in the From: field for determining whether a message is coming from a domain with "good reputation" (that is, from a domain that is not known for leaking spam). So even if an aggressive HCP opts to remove the human-readable part from any From: header field, and to standardize/genericize the local part of the From: address, the domain will still leak.
An Intermediary Can Trick a Recipient into Overestimating the Cryptographic Status of a Header Field in an Encrypted Message When an encrypted (or signed-and-encrypted) message is in transit, an active intermediary can strip or tamper with any header field that appears outside the Cryptographic Envelope. For example, if the original sender's HCP passes through the Cc: header field unchanged, a cleanly-delivered message would indicate that the Cc: header field has a cryptographic status of signed. But if an intermediary attacker simply removes the header field from the unprotected header section before forwarding the message, then the recipient would believe that the field has a cryptographic status of signed-and-encrypted. An attacker can thus induce a false sense of confidentiality in a recipient whose MUA actually did not provide that level of privacy. This draft offers protection against such an attack by way of the HP-Obscured and HP-Removed header fields that can be found on the cryptographic payload. If a header field appears to have been obscured, but no HP-Obscured header matches it; or if the header field appears to have been removed, but the HP-Removed header does not include its field name, the receiving MUA can indicate to the user that the header field in question may not have been confidential. However, in such a case, a conservative MUA may still decide to treat the header field in question as signed-and-encrypted during reply, to avoid accidental leakage of the cleartext value in the reply message, as described in .
Summary and Implementation Guidance In the abstract sense, the above concerns are of course also true for any encrypted data, including the body of the message: if the sender isn't careful, the message contents or session keys could leak in many different ways that are beyond the scope of this draft. The message recipient has no way in principle to tell whether the apparent confidentiality of any given piece of encrypted content has been broken via channels that they cannot perceive. And an active intermediary aware of the recipient's public key can always encrypt a cleartext message in transit to give the recipient a false sense of security. A receiving MUA should be cautious about how it represents the cryptographic status of encrypted-only and signed-and-encrypted header fields to the user, to avoid overpromising. However, the MUA should also strive to avoid additional leakage of these header fields, as described in .
Privacy and Deliverability Risks with Bcc and Encrypted Messages As noted in , handling Bcc when generating an encrypted e-mail message can be particularly tricky. With header protection, there is an additional wrinkle. When an encrypted e-mail message with header protection has a Bcc'ed recipient, and the composing MUA explicitly includes the Bcc'ed recipient's address in their copy of the message (see the "second method" in ), that Bcc header field will always be visible to the Bcc'ed recipient. In this scenario, though, the composing MUA has one additional choice: whether to hide the Bcc header field from intervening message transport agents, by returning null when the HCP is invoked for Bcc . If the composing MUA's rationale for including an explicit Bcc in the copy of the message sent to the Bcc recipient is to ensure deliverability via a message transport agent that inspects message headers, then stripping the Bcc field during encryption may cause the intervening transport agent to drop the message entirely. This is why Bcc is not explicitly stripped in hcp_minimal. If, on the other hand, deliverability to a Bcced recipient is not a concern, the most privacy-preserving option is to simply omit the Bcc header field from the protected header section in the first place. A MUA that is capable of receiving and processing such a message can infer that since their user's address was not mentioned in any To or Cc header field, they were likely a Bcc recipient. Please also see for more discussion about Bcc and encrypted messages.
IANA Considerations This document request IANA to register the following header fields in the "Permanent Message Header Field Names" Registry in accordance with . Header field name: HP-Removed Applicable protocol: mail Status: standard Author/change controller: IETF Specification document(s): of RFCXXX Header field name: HP-Obscured Applicable protocol: mail Status: standard Author/change controller: IETF Specification document(s): of RFCXXX This document also defines a parameter protected-headers for the Content-Type header field, which is used to identify cryptographic payloads that use this form of header protection. The possible values of the protected-headers parameter are v1 (meaning Injected Headers, see ) and wrapped (meaning Wrapped Message, see ).
Acknowledgments The authors would like to thank the following people who have provided helpful comments and suggestions for this document: Berna Alp, Bernhard E. Reiter, Claudio Luck, David Wilson, Hernani Marques, juga, Krista Bennett, Kelly Bristol, Lars Rohwedder, Robert Williams, Russ Housley, Sofia Balicka, Steve Kille, Volker Birk, and Wei Chuang.
Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies This initial document specifies the various headers used to describe the structure of MIME messages. [STANDARDS-TRACK] Registration Procedures for Message Header Fields This specification defines registration procedures for the message header fields used by Internet mail, HTTP, Netnews and other applications. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Augmented BNF for Syntax Specifications: ABNF Internet technical specifications often need to define a formal syntax. Over the years, a modified version of Backus-Naur Form (BNF), called Augmented BNF (ABNF), has been popular among many Internet specifications. The current specification documents ABNF. It balances compactness and simplicity with reasonable representational power. The differences between standard BNF and ABNF involve naming rules, repetition, alternatives, order-independence, and value ranges. This specification also supplies additional rule definitions and encoding for a core lexical analyzer of the type common to several Internet specifications. [STANDARDS-TRACK] Internet Message Format This document specifies the Internet Message Format (IMF), a syntax for text messages that are sent between computer users, within the framework of "electronic mail" messages. This specification is a revision of Request For Comments (RFC) 2822, which itself superseded Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages", updating it to reflect current practice and incorporating incremental changes that were specified in other RFCs. [STANDARDS-TRACK] Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification This document defines Secure/Multipurpose Internet Mail Extensions (S/MIME) version 4.0. S/MIME provides a consistent way to send and receive secure MIME data. Digital signatures provide authentication, message integrity, and non-repudiation with proof of origin. Encryption provides data confidentiality. Compression can be used to reduce data size. This document obsoletes RFC 5751. Problem Statement and Requirements for Header Protection Isode Ltd Ucom.ch Privacy and security issues with email header protection in S/MIME have been identified for some time. However, the desire to fix these issues has only recently been expressed in the IETF LAMPS Working Group. The existing S/MIME specification is likely to be updated regarding header protection. This document describes the problem statement, generic use cases, and requirements of header protection. Guidance on End-to-End E-mail Security American Civil Liberties Union End-to-end cryptographic protections for e-mail messages can provide useful security. However, the standards for providing cryptographic protection are extremely flexible. That flexibility can trap users and cause surprising failures. This document offers guidance for mail user agent implementers that need to compose or interpret e-mail messages with end-to-end cryptographic protection. It provides a useful set of vocabulary as well as suggestions to avoid common failures. Key words for use in RFCs to Indicate Requirement Levels In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings. Evolving Chrome's security indicators Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples This set of documents, collectively called the Multipurpose Internet Mail Extensions, or MIME, redefines the format of messages. This fifth and final document describes MIME conformance criteria as well as providing some illustrative examples of MIME message formats, acknowledgements, and the bibliography. [STANDARDS-TRACK] MIME Security with OpenPGP This document describes how the OpenPGP Message Format can be used to provide privacy and authentication using the Multipurpose Internet Mail Extensions (MIME) security content types described in RFC 1847. [STANDARDS-TRACK] DomainKeys Identified Mail (DKIM) Signatures DomainKeys Identified Mail (DKIM) permits a person, role, or organization that owns the signing domain to claim some responsibility for a message by associating the domain with the message. This can be an author's organization, an operational relay, or one of their agents. DKIM separates the question of the identity of the Signer of the message from the purported author of the message. Assertion of responsibility is validated through a cryptographic signature and by querying the Signer's domain directly to retrieve the appropriate public key. Message transit from author to recipient is through relays that typically make no substantive change to the message content and thus preserve the DKIM signature.This memo obsoletes RFC 4871 and RFC 5672. [STANDARDS-TRACK] Internationalized Email Headers Internet mail was originally limited to 7-bit ASCII. MIME added support for the use of 8-bit character sets in body parts, and also defined an encoded-word construct so other character sets could be used in certain header field values. However, full internationalization of electronic mail requires additional enhancements to allow the use of Unicode, including characters outside the ASCII repertoire, in mail addresses as well as direct use of Unicode in header fields like "From:", "To:", and "Subject:", without requiring the use of complex encoded-word constructs. This document specifies an enhancement to the Internet Message Format and to MIME that allows use of Unicode in mail addresses and most header field content.This specification updates Section 6.4 of RFC 2045 to eliminate the restriction prohibiting the use of non-identity content-transfer- encodings on subtypes of "message/". [STANDARDS-TRACK] Domain-based Message Authentication, Reporting, and Conformance (DMARC) Domain-based Message Authentication, Reporting, and Conformance (DMARC) is a scalable mechanism by which a mail-originating organization can express domain-level policies and preferences for message validation, disposition, and reporting, that a mail-receiving organization can use to improve mail handling.Originators of Internet Mail need to be able to associate reliable and authenticated domain identifiers with messages, communicate policies about messages that use those identifiers, and report about mail using those identifiers. These abilities have several benefits: Receivers can provide feedback to Domain Owners about the use of their domains; this feedback can provide valuable insight about the management of internal operations and the presence of external domain name abuse.DMARC does not produce or encourage elevated delivery privilege of authenticated email. DMARC is a mechanism for policy distribution that enables increasingly strict handling of messages that fail authentication checks, ranging from no action, through altered delivery, up to message rejection. S/MIME Example Keys and Certificates American Civil Liberties Union The S/MIME development community benefits from sharing samples of signed or encrypted data. This document facilitates such collaboration by defining a small set of X.509v3 certificates and keys for use when generating such samples. pretty Easy privacy (pEp): Privacy by Default pEp Foundation pEp Foundation pEp Foundation The pretty Easy privacy (pEp) model and protocols describe a set of conventions for the automation of operations traditionally seen as barriers to the use and deployment of secure, privacy-preserving end- to-end messaging. These include, but are not limited to, key management, key discovery, and private key handling (including peer- to-peer synchronization of private keys and other user data across devices). Human Rights-enabling principles like data minimization, end-to-end and interoperability are explicit design goals. For the goal of usable privacy, pEp introduces means to verify communication between peers and proposes a trust-rating system to denote secure types of communications and signal the privacy level available on a per-user and per-message level. Significantly, the pEp protocols build on already available security formats and message transports (e.g., PGP/MIME with email), and are written with the intent to be interoperable with already widely-deployed systems in order to ease adoption and implementation. This document outlines the general design choices and principles of pEp. pretty Easy privacy (pEp): Email Formats and Protocols pEp Foundation pEp Foundation The proposed pretty Easy privacy (pEp) protocols for email are based upon already existing email and encryption formats (such as PGP/MIME) and designed to allow for easily implementable and interoperable opportunistic encryption. The protocols range from key distribution, secret key synchronization between own devices, to mechanisms of metadata and content protection. The metadata and content protection is achieved by moving the whole message (not only the body part) into the PGP/MIME encrypted part. The proposed pEp Email Formats not only achieve simple forms of metadata protection (like subject encryption), but also allow for sending email messages through a mixnet. Such enhanced forms of metadata protection are explicitly discussed within the scope of this document. The purpose of pEp for email is to simplify and automate operations in order to make usage of email encryption viable for a wider range of Internet users, with the goal of achieving widespread implementation of data confidentiality and privacy practices in the real world. The proposed operations and formats are targeted towards Opportunistic Security scenarios and are already implemented in several applications of pretty Easy privacy (pEp). Cascading Style Sheets Level 2 Revision 2 (CSS 2.2) Specification World Wide Web Consortium Authentication of Usenet Group Changes UUNET Technologies, Inc. Signing Control Messages, Verifying Control Messages Using character escapes in markup and CSS W3C MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text This particular document is the third document in the series. It describes extensions to RFC 822 to allow non-US-ASCII text data in Internet mail header fields. [STANDARDS-TRACK]
Possible Problems with some Legacy Clients When an e-mail message with end-to-end cryptographic protection is received by a mail user agent, the user might experience many different possible problematic interactions. A message with header protection may introduce new forms of user experience failure. In this section, the authors enumerate different kinds of failures we have observed when reviewing, rendering, and replying to messages with different forms of header protection in different legacy MUAs. Different legacy MUAs demonstrate different subsets of these problems. Hopefully, a non-legacy MUA would not exhibit any of these problems. An implementer updating their legacy MUA to be compliant with this specification should consider these concerns and try to avoid them.
Problems Reviewing signed-and-encrypted Messages in List View Unprotected Subject, Date, From, To are visible Threading is not visible
Problems when Rendering a signed-and-encrypted Message Unprotected Subject is visible Protected subject (on its own) is visible in the body Protected subject, date, from, to visible in the body User interaction needed to view whole message User interaction needed to view message body User interaction needed to view protected subject Impossible to view protected subject Nuisance alarms during user interaction Impossible to view message body Appears as a forwarded message Appears as an attachment Security indicators not visible User has multiple different methods to Reply: (e.g. reply to outer, reply to inner) User sees English "Subject:" in body despite message itself being in non-English Security indicators do not identify protection status of header fields Header fields in body render with local header field names (e.g. showing "Betreff" instead of "Subject") and dates (TZ, locale)
Problems when Replying to a signed-and-encrypted Message Note that the use case here is: User views message, to the point where they can read it. User then replies to message, and they are shown a message composition window, which has some UI elements If the MUA has multiple different methods to Reply: to a message, each way may need to be evaluated separately This section also uses the shorthand UI:x to mean "the UI element that the user can edit that they think of as x." protected subject is in UI:subject (and will leak) protected subject is quoted in UI:body protected subject is not anywhere in UI message body is not visible/quoted in UI:body user cannot reply while viewing protected message reply is not encrypted by default (but is for normal S/MIME sign+enc messages) unprotected From: is in UI:To User's locale (lang, TZ) leaks in quoted body Header fields not protected (and in particular, Subject is not obscured) by default
Problems Reviewing signed-only Messages in List View Unprotected Subject, Date, From, To are visible Threading is not visible
Problems when Rendering a signed-only Message Unprotected Subject is visible Protected subject (on its own) is visible in the body Protected subject, date, from, to visible in the body User interaction needed to view whole message User interaction needed to view message body User interaction needed to view protected subject Impossible to view protected subject Nuisance alarms during user interaction Impossible to view message body Appears as a forwarded message Appears as an attachment Security indicators not visible Security indicators do not identify protection status of header fields User has multiple different methods to Reply: (e.g. reply to outer, reply to inner) Header fields in body render with local header fields (e.g. showing "Betreff" instead of "Subject") and dates (TZ, locale)
Problems when Replying to a signed-only Message This uses the same use case(s) and shorthand as . Unprotected Subject: is in UI:subject Protected Subject: is quoted in UI:body Protected Subject: is not anywhere in UI Message body is not visible/quoted in UI:body User cannot reply while viewing protected message Unprotected From: is in UI:To User's locale (lang, TZ) leaks in quoted body
Test Vectors This section contains sample messages using the different schemes described in this document. Each sample contains a MIME object, a textual and diagrammatic view of its structure, and examples of how an MUA might render it. The cryptographic protections used in this document use the S/MIME standard, and keying material and certificates come from . These messages should be accessible to any IMAP client at imap://bob@header-protection.cmrg.net/ (any password should authenticate to this read-only IMAP mailbox). You can also download copies of these test vectors separately at https://header-protection.cmrg.net. If any of the messages downloaded differ from those offered here, this document is the canonical source.
Baseline Messages These messages offer no header protection at all, and can be used as a baseline. They are provided in this document as a counterexample. An MUA implementer can use these messages to verify that the reported cryptographic summary of the message indicates no header protection.
No cryptographic protections over a simple message This message uses no cryptographic protection at all. Its body is a text/plain message. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:00:02 -0500 User-Agent: Sample MUA Version 1.0 This is the no-crypto message. This message uses no cryptographic protection at all. Its body is a text/plain message. -- Alice alice@smime.example ]]>
S/MIME signed-only signedData over a simple message, No Header Protection This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a text/plain message. It uses no header protection. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:01:02 -0500 User-Agent: Sample MUA Version 1.0 MIILFwYJKoZIhvcNAQcCoIILCDCCCwQCAQExDTALBglghkgBZQMEAgEwggFABgkq hkiG9w0BBwGgggExBIIBLU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IHRleHQvcGxhaW47IGNoYXJzZXQ9InV0Zi04Ig0KQ29udGVudC1UcmFuc2Zlci1F bmNvZGluZzogN2JpdA0KDQpUaGlzIGlzIHRoZSBzbWltZS1vbmUtcGFydCBtZXNz YWdlLg0KDQpUaGlzIGlzIGEgc2lnbmVkLW9ubHkgUy9NSU1FIG1lc3NhZ2Ugdmlh IFBLQ1MjNyBzaWduZWREYXRhLiAgVGhlDQpwYXlsb2FkIGlzIGEgdGV4dC9wbGFp biBtZXNzYWdlLiBJdCB1c2VzIG5vIGhlYWRlciBwcm90ZWN0aW9uLg0KDQotLSAN CkFsaWNlDQphbGljZUBzbWltZS5leGFtcGxlDQqgggemMIIDzzCCAregAwIBAgIT Dy0lvRE5l0rOQlSHoe49NAaKtDANBgkqhkiG9w0BAQ0FADBVMQ0wCwYDVQQKEwRJ RVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJT QSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAgFw0xOTExMjAwNjU0MThaGA8yMDUy MDkyNzA2NTQxOFowOzENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx FzAVBgNVBAMTDkFsaWNlIExvdmVsYWNlMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A MIIBCgKCAQEAmpUp+ovBouOP6AFQJ+RpwpODxxzY60n1lJ53pTeNSiJlWkwtw/cx Qq0t4uD2vWYB8gOUH/CVt2Zp1c+auzPKJ2Zu5mY6kHm+hVB+IthjLeI7Htg6rNeu Xq50/TuTSxX5R1I1EXGt8p6hAQVeA5oZ2afHg4b97enV8gozR0/Nkug4AkXmbk7T HNc8vvjMUJanZ/VmS4TgDqXjWShplcI3lcvvBZMswt41/0HJvmSwqpS6oQcAx3We ag0yCNj1V9V9yu/3DjcYbwW2lJf5NbMHbM1LY4X5chWfNEbkN6hQury/zxnlsukg n+fHbqvwDhJLAgFpW/jA/EB/WI+whUpqtQIDAQABo4GvMIGsMAwGA1UdEwEB/wQC MAAwFwYDVR0gBBAwDjAMBgpghkgBZQMCATABMB4GA1UdEQQXMBWBE2FsaWNlQHNt aW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYIKwYBBQUHAwQwDgYDVR0PAQH/BAQDAgUg MB0GA1UdDgQWBBSiU0HVRDyAKRV8ASPw546vzfN3DzAfBgNVHSMEGDAWgBSRMI58 BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0BAQ0FAAOCAQEAgUl4oJyxMpwWpAyl OvK6NEbMl1gD5H14EC4Muxq1u0q2XgXOSBHI6DfX/4LDsfx7fSIus8gWVY3WqMeu OA7IizkBD+GDEu8uKveERRXZncxGwy2MfbH1Ib3U8QzTjqB8+dz2AwYeMxODWq9o pwtA/lTOkRg8uuivZfg/m5fFo/QshlHNaaTDVEXsU4Ps98Hm/3gznbvhdjFbZbi4 oZ3tAadRlE5K9JiQaJYOnUmGpfB8PPwDR6chMZeegSQAW++OIKqHrg/WEh4yiuPf qmAvX2hZkPpivNJYdTPUXTSO7K459CyqbqG+sNOo2kc1nTXl85RHNrVKQK+L0YWY 1Q+hWDCCA88wggK3oAMCAQICEzdBBXntdX9CqaJcOvT4as6aqdcwDQYJKoZIhvcN AQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNV BAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwIBcN MTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIw DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALT0iehYOBY+TZp/T5K2KNI05Hwr +E3wP6XTvyi6WWyTgBK9LCOwI2juwdRrjFBSXkk7pWpjXwsA3A5GOtz0FpfgyC7O xsVcF7q4WHWZWleYXFKlQHJD73nQwXP968+A/3rBX7PhO0DBbZnfitOLPgPEwjTt dg0VQQ6Wz+CRQ/YbHPKaw7aRphZO63dKvIKp4cQVtkWQHi6syTjGsgkLcLNau5LZ DQUdsGV+SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/2NKRu0BXnDe/N+iDz3X0zEoj 0fqXgq4SWcC0nsG1lyyXt1TL270I6ATKRGJWiQVCCpDtc0NT6vdJ45bCSzsCAwEA AaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUDAgEwATAe BgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoGCCsGAQUF BwMEMA4GA1UdDwEB/wQEAwIGwDAdBgNVHQ4EFgQUu/bMsi0dBhIcl64papAQ0yBm ZnMwHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZIhvcNAQEN BQADggEBAHOJojanzqmgaSN3/gqSQ4cbbmdj/R40BEPr+gXT+xiidfZ2iLNwYyTn euK6AChwKfnNvOFb8lV1iffRTF/KtmVEDMR/sYeqAH83KM5p3el2lVh4OHhyI0qN uz5oShNaACSioQ23WxHGVy9vsdVfnbhsplrWg9NQ2WbpCmK+2oMh2oYl0Z/wvXMt 9cG6jbMvcdH4z0IOvg6mrYkKTM/RCGnumghxwYToj1OyD5Gs4D2IJCw+fX5ODxh5 2MbNRYXTus2ZPRPM8JXNQC4GWv4km3M4rKnJDd6hnoQ9rNeozIcBVyybQYjfrgg4 DRvw9Ksk22OH4ConlB8f7R7s1LM2cSYxggIAMIIB/AIBATBsMFUxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMg UlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhM3QQV57XV/QqmiXDr0+GrOmqnX MAsGCWCGSAFlAwQCAaBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZI hvcNAQkFMQ8XDTIxMDIyMDE1MDEwMlowLwYJKoZIhvcNAQkEMSIEIESMi+9/LUlD fGjj+6U50VNLFxbzvyVJ0wzwnTS114DyMA0GCSqGSIb3DQEBAQUABIIBACJHeayB UllC4GdcgdojTUjoeIy6UIbrSg/aKZgAkCB8Dwq0hdU10qiun6WKI/TxM5izpRvL UsNBGmqknPBMFhvwX6KCrwFk0p0j5Y5DZqX30deiQiGTUv3NiwZGTrKJ3JkyymFO HGbe5Thrq3inRLVfilEuIZewaJsnJhKfnEq9fS09icTJ5olPDAH6mZbW6hpYmU3F KBk2qJNqJX6bo60rCogu3wXDj0wxnqEXmeNDH5/+L9UVZur+EWzviUc8Ldd/kP3L DOO7ivs10bAWe8Tbw7NjuP8ZlVvzcvj3nXWzZzxh2ymDIOvyJA+t0LHQvsN/fbdW fC6Pm51fEkabbmw= ]]>
S/MIME signed-only multipart/signed over a simple message, No Header Protection This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses no header protection. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:02:02 -0500 User-Agent: Sample MUA Version 1.0 --052 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit This is the smime-multipart message. This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses no header protection. -- Alice alice@smime.example --052 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name="smime.p7s" MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTAyMDJa MC8GCSqGSIb3DQEJBDEiBCDAkJYhqVAHhprkzEWP6PweksoYhj5ULTLbcfQ9Tu3C zDANBgkqhkiG9w0BAQEFAASCAQCJe818STb4M4utvQsdcQEH0CZR7I38uL5TSZF3 llKmD9PuCDuV3GIkfdmZISKRuffBle1xaNc2av/0Qogr7OaFF485DAONVAEIQ7ah t94pwgAE4yvXXWKmFQkKid1tnMXbnHADKWU0YC+BQkgd/5J3zg4ESeMwOUm0+b3C GDaUBTIJhHfu9sqlt7jXa7PbzQEfemYZORPI14/uZSs86SLkPvNGUpWb4mN6olC0 2h/U4SCpq8Oy390oNM0VNpoa+nsTu5yOFc34pMIvjwCJyIOYPaDnvw9FYgr2oOp7 cdOgFcSJ8q7I+Tx2yg60VW8tAT7UBkifc37UUuVbnOsqeVB3 --052-- ]]>
S/MIME encrypted and signed over a simple message, No Header Protection This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses no header protection. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:03:02 -0500 User-Agent: Sample MUA Version 1.0 MIITXAYJKoZIhvcNAQcDoIITTTCCE0kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHmnSO2IdHZqhpStR4KWdgv3WQtCaxYUhXTJ AmWV0NBvy5u7gilyKnpgY7CcJ4T5bA68lWNos4i4D2bsiLDGtMAuEynCKejeKp+r rS6BU+iI3QAruW8v4xxFHmYtOdge1tV1uws7atc8fXnUlgcfpnOD+IvLOdwkrJBs o0AePTxqKmi3pUkSoZ4FVkfXJNkM3KKlXsqf5VFJV21r/AY+3w5V5sFkengnXv6e kAZWUVMZ5GiiLzCk54l2rGO3Wi5oC1cYqkbmnKndm2MvcwEosO48N6XTvW9geENp y9stPxv9pAp9HD4miuwWA2KlUPBVLh7l7XwjDwA08MGsRCzHP64wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAdOnjKorhe+/7PA3sZPAMGBA6 bQlRDw3HF8/5y4ld+ZCHw02YeGKvc4OT1TO4SsY8zdOhNBhJRaQqRkK+5HKOOPqV ADA6a90U36FAyNI0Zn8veG4rHlb/vWHVdxWbOW69Liymia3fBz65o/6E1yX/GAb8 m+KPtKx9cvSFCazv95M4C3Girn8LkAswtmwR+deEp7tYPdjHky7TOkdXpV/z0Ee9 HtjilLeqUD+mvV3CJkIbywsUBRsZ0iLA8B9WoIsvcpYDU1biaxMko0rWlUFh2VSd j6+TjlW90dSZM7xUF1YefRDd9XnF+HcRNbO58ucu8iIMxVJq+LNBEY4N70XmFjCC EC4GCSqGSIb3DQEHATAdBglghkgBZQMEAQIEEMyuzbDBN6Tv2WSNq2aSZ5WAghAA nq1HKlEGKfDdd9BKbpZgRqgsSUEEBdGSgAC4v0Ugu6eD+ukLBk+TZzGuLHFj1vB3 /Nk6mjv4xakp/x23yGk7zc6bzmHduR27avvu9zZf8fdeNMkwBeuB47WIXEnQKmlt y6I7vVEJJE4CEVF0VDIFH7B2wpo5pogs0N3vJt/Gr2vAO2NjRosgGuHTRDXybQlY KZKOCw2G0+vB1CYCP9YeM5gG7vQNirjQdVPJ0K+4NOEHy8JZHQZvu7dR2P02/QiS 5p8wcYPSRLsWRdaPaBDnfkDTWaaQYUcm909iydoYUI5Xg33LzjGh0UMDg0vouQ/1 Aqj7zwHXfHJVKJ38lSQC8fL88/TaCkouGMAw/dHCUQYOB5v4JlsSaYBo8ojaPIIk T6PYuFUo01ghi56h21sKNsuhnYSR8c8rZMq3jIKDkmdjOpNpn6kevulBHeNnH1wK WPBiMx4CAapizFjeVmbgnFbjNBdw2kO55bPqXrHMoG5/hHC85JV/IgCF0uvQgOY/ kG2eTl80pJ3dF3/iJnHsn6wB50UDPYAqXt9bpAgtNNd0iCyd5Gd3guQOCAfvpBOO IkMPH2K8xsvqk6cUncEtrbSColrldePnQhiTiwyAmJevan++mvjUuBRPN1grXH4v AeCR28K+htOxC/5SaONcLX6FhppX0MR09j4nlwlWvvXfmm0Bo3eyaYqLAatmId1/ ig17gk0JQBw2zzZHqEm1URQh50r/6DvStMj2ASjGgtsPPhBQKO+CaITceLhuRNyw cH3tSLeGmhMj0lDT6gmB/d3PFcLjUx8DwCwYsshDY3Z15GrzIq1jgZvmzjBxaCuA VPGA3jWMOwBdJtXhAP7uYCe5qjbTL9L6EqIo8RQl7zrXxP7etwSjbAFbTUKBxxik AZKPAGoTFsO3cVhUBmSzoMupgiUAieTOOS43iP9JeXLFHOnN+cAlo7iJx/gEcL68 1ENpSaWRV00NBtF6vjpNIEh7eN0MCA/fTipRR7Pz+g2oKQLUZPNkVxUTi7PjoSPb bfKpK0xbHqao40mJdNvX6lng73PsQnJGadYu6DnMvVG7oTibcsA3aoh3jreb1vLO mzpATxg4b1QFC0Cjxqd8FKRxQZlync5cO5E3EhYlVXW0pi17wW/a2Ca7S8iT3+Rw bVNd2A01JgS6r+NsvgIXQTjxA6RNzP3K1Iorkuhg6nNbqgJffskHz5uD72AXQc9J OfxGIFAgnIbNr9u+pvj3WVqJLZTHFdDvvXPGza5/D3tnoWb83j8Z9T8pxlTGK3m2 GVFm4CyJxdzDrOcfXznRO3lYkNeTA0lSySF0yhTHAzIOU8lYaUT/2P4y28Fc/79w ofFZSqVz+J2QCoGbZfbWsj8RbrcaPYzPj0cBWtUxPyCni0Mf/4if+GxLv1F8a7DI onHVJg5w+Lo1RKcvPpRIrq/w7wrwFOhEehyQr6a/8WbiAOSMMRsqj3+9atQViPFb QChAtGHq1TMWysVVGod4S3OhkiOsp1s6tOFCJb8QIL2DYlDSbg/wtnNbWA0BXytf tR1bhQRI0ytm7mhN01kfW+dWXOPqzofRG/zvaKIGoufnmqJpbk4RR4r+KHUZ3xDP 2URkSh5Qrf9yZ7wE791QKomGSZygvX1Tp8TzicUWpeTQB0IHXsCg2JBTykU3q3m/ SV1NYl6oP6oClvVAzRNxQgs6TQ8PEgGqPsE323VDCpgAnqsA5zq5zeZjjEK8p+Zy HWjcaWf1top6+l9Tt/5chnAmCk4wS120Lkisu7fOzB9M8UzQC0yVrJ4L1A/MD73Q KE1zP92o87ZfJnnNjpBb4A/EcBTmhVxbjSlC4cT6UR08pv0cfhSqFni9eMhImQmS 0XST/0NkVeqBmC6b72fATGQb09Iv02pyV/2w5W04gCNCvWBN8kmQQLEEhkDaOmZD OYxGkgfbT00RxsC2fa8VnRuc8FyRJwFO9qWn8OTNhnVHbd3DPfsoTHNl5v7dsGDz 0aOnVMmwSmAFfzQStA9qC+OPeBPXBCKNXd1Y7/7ruO0GpUW9hSHKkOc227QtbTAH LdUAW1bBIPA3gNJQDkmGQaefVFJDV8xn9v/lRuVxegh4N8QIK1U9IPz7+wec81S/ 4cXz/JT01u/oGpcSE86jzarGMh/ik3ovckGLvH7q7TdT5BdOYyZZa6PcinfkT1Tj rj/SMsHH3alXNipnSnb+5OdEIQUJksSgQYE1nFgV2M9PBONy3YA07Z2ArF/f0sEf hRKQw9YH9grv0beRA0C5182tvvKrZ5j0q6gttYZ8PacoD9DnaXJjNGKJ01jwNsmV vlPx7G8yOuxx2qUuTBbqr8jHg7XR9/UaYEuvmDslQZpnuDMOrxuRPufI1nWVZVd7 wxWd588fI3XOXmE9ZA2/kq5uq57xpoRLlPh/sVqVysj9ruYTU7uHz629jFeq5mF4 iIpa80hPVJyC4gDtKLqF8Jb8VVKb4kdbTph6+pcRwnqIj6pEZq4G8FvquntzNn0o 8ydpnyZVV/bu+Py7MYq8YtkcEVvIk70b9gBI3UhKEL1PfRj/t/q0XM2C63a+c93j 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]]>
No cryptographic protections over a complex message This message uses no cryptographic protection at all. Its body is a multipart/alternative message with an inline image/png attachment. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:00:02 -0500 User-Agent: Sample MUA Version 1.0 --c39 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="05a" --05a Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit This is the no-crypto-complex message. This message uses no cryptographic protection at all. Its body is a multipart/alternative message with an inline image/png attachment. -- Alice alice@smime.example --05a Content-Type: text/html; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit

This is the no-crypto-complex message.

This message uses no cryptographic protection at all. Its body is a multipart/alternative message with an inline image/png attachment.

--
Alice
alice@smime.example

--05a-- --c39 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --c39-- ]]>
S/MIME signed-only signedData over a complex message, No Header Protection This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:01:02 -0500 User-Agent: Sample MUA Version 1.0 MIIPHwYJKoZIhvcNAQcCoIIPEDCCDwwCAQExDTALBglghkgBZQMEAgEwggVIBgkq hkiG9w0BBwGgggU5BIIFNU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjMzZSINCg0KLS0zM2UNCk1JTUUt VmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2 ZTsgYm91bmRhcnk9ImUwYiINCg0KLS1lMGINCkNvbnRlbnQtVHlwZTogdGV4dC9w bGFpbjsgY2hhcnNldD0idXMtYXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29u dGVudC1UcmFuc2Zlci1FbmNvZGluZzogN2JpdA0KDQpUaGlzIGlzIHRoZSBzbWlt ZS1vbmUtcGFydC1jb21wbGV4IG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBzaWduZWQt b25seSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEuICBUaGUN CnBheWxvYWQgaXMgYSBtdWx0aXBhcnQvYWx0ZXJuYXRpdmUgbWVzc2FnZSB3aXRo IGFuIGlubGluZQ0KaW1hZ2UvcG5nIGF0dGFjaG1lbnQuIEl0IHVzZXMgbm8gaGVh ZGVyIHByb3RlY3Rpb24uDQoNCi0tIA0KQWxpY2UNCmFsaWNlQHNtaW1lLmV4YW1w bGUNCi0tZTBiDQpDb250ZW50LVR5cGU6IHRleHQvaHRtbDsgY2hhcnNldD0idXMt YXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29udGVudC1UcmFuc2Zlci1FbmNv ZGluZzogN2JpdA0KDQo8aHRtbD48aGVhZD48dGl0bGU+PC90aXRsZT48L2hlYWQ+ PGJvZHk+DQo8cD5UaGlzIGlzIHRoZSA8Yj5zbWltZS1vbmUtcGFydC1jb21wbGV4 PC9iPiBtZXNzYWdlLjwvcD4NCjxwPlRoaXMgaXMgYSBzaWduZWQtb25seSBTL01J TUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEuICBUaGUNCnBheWxvYWQg aXMgYSBtdWx0aXBhcnQvYWx0ZXJuYXRpdmUgbWVzc2FnZSB3aXRoIGFuIGlubGlu ZQ0KaW1hZ2UvcG5nIGF0dGFjaG1lbnQuIEl0IHVzZXMgbm8gaGVhZGVyIHByb3Rl Y3Rpb24uPC9wPg0KPHA+PHR0Pi0tIDxici8+QWxpY2U8YnIvPmFsaWNlQHNtaW1l LmV4YW1wbGU8L3R0PjwvcD48L2JvZHk+PC9odG1sPg0KLS1lMGItLQ0KDQotLTMz ZQ0KQ29udGVudC1UeXBlOiBpbWFnZS9wbmcNCkNvbnRlbnQtVHJhbnNmZXItRW5j b2Rpbmc6IGJhc2U2NA0KQ29udGVudC1EaXNwb3NpdGlvbjogaW5saW5lDQoNCmlW Qk9SdzBLR2dvQUFBQU5TVWhFVWdBQUFCUUFBQUFVQ0FZQUFBQ05pUjBOQUFBQWNF bEVRVlI0MnVWVE94YkENCk1BZ1M3MzluTzNUcFJ3MjBkcXBiZkFSUUVqT3l3aXdZ bkN0a0RLbmJjTGs2NnNxbFQrenQ5Y2lka0UrNkt3a1oNCnNncnpmY3FWTXBMMmpv MDQ0N2dZRHBlQXJrK09uSkhrSWhBZlRQUmljaWhBZjVZSnJ3N3ZqdjBaV1JXTS91 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DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTIxMDIyMDE3MDEwMlow LwYJKoZIhvcNAQkEMSIEIMhGVzAx/S4dUwqko0cb+oa+gXfmEqw2Iz+svSKpWzC+ MA0GCSqGSIb3DQEBAQUABIIBAGtNM3MMhWZVJdN1nlfSk3mhNk6E+LFoOqG4aiHz e+HEQjN6bKft5zulMCqh7NKRpRmDcEE9RXDGKGYQ9BKBf6Od/04lolBY/xpPu9G5 XnUTHN3MmqubrTSP3xxU5AozL8i7XmkB68VxKBQ2YpfcXBFGbuvlc6FXkbh2QtRX UgBZEp+GSxG7o0UVJRa97t6wblUdMwaQ1ONrtBsmrO46bThv4cgrlGBvz8tGfHwR 4HbS/Rp+6jNAS0K9fZ0PQxy2b4M4braYg3f1n4q3dDH8N0XiUcwG8FiB9XQo18+D fdkZwTVUoDHWjSVdIREobdPI2wdpnGxS/AB1VuiYpcebi4o= ]]>
S/MIME signed-only multipart/signed over a complex message, No Header Protection This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:02:02 -0500 User-Agent: Sample MUA Version 1.0 --452 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="ac5" --ac5 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="813" --813 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit This is the smime-multipart-complex message. This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection. -- Alice alice@smime.example --813 Content-Type: text/html; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit

This is the smime-multipart-complex message.

This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection.

--
Alice
alice@smime.example

--813-- --ac5 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --ac5-- --452 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name="smime.p7s" MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzAyMDJa MC8GCSqGSIb3DQEJBDEiBCBwnBPnNMORN+JxFvMbZIJ5PtqEBkyDbOtU1Ar5RuGl LjANBgkqhkiG9w0BAQEFAASCAQBRpXYXiiCEQ/lshkbhpH566H65wAf9rZbGn+r+ o8vLTFSs84ER/EAHGhePmVDiObJS+nXIC7Sa5Y+tUe8JitKPXBQ2oDq2+3tN7tY5 G398yv+LnmYMMf91dlnlyPnQujsEfPSLXYNToa0qBqp1DThm/pfn6RbbOqpZjYr9 fdcNdErDql5+CKaf8R/JDW+hiLyvD0KCpXucWLHb1okt1Jpld4kkaA4wu9Idh9fK GlN20s+dBXoytH/G6K8NhOh3Qaf3lMP1R60gkvJVJ3j9jIs3/ZG4qH5qWQJHLvi2 WLSxDhkYmZ+dYSCyfIauNkq7a0wauSpZj82elFA7HdyZmNp0 --452-- ]]>
S/MIME encrypted and signed over a complex message, No Header Protection This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses no header protection. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:03:02 -0500 User-Agent: Sample MUA Version 1.0 MIIZDAYJKoZIhvcNAQcDoIIY/TCCGPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAB5TXoiCIIIIxehywh5/tdFM72iw946N6OzE mkIj1x+ShPweKrmTgPxaZbNgZpMdyNetqSXTn5HlZwUAxOkE+EPp301kveWwxBAM /Umzr/ODGiYLHWORWh+cPwjo0OIHo8IJzmF9FWMr7CKYhvbSZn3AFuERRfEccwH9 xsbB+X5og5bu0Mn3y8KdX7XOFVbgAgFuqqWpj6mK2AsyWS0zRKnGNd72rELjEzCv RZqBFAecaxdJd2RXKKwLmJg5EL/VmKuyN6TgtmtwvzGCKc5YywdhVrP2IvQTye10 +paj8dFQb3W9AGOuCdw8r5CoawAZdYMvZ/v0ixYIkQid7fsOE+AwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAFLvnVkTKKAXPN6g5xLlw/7bO 5NQs0DVNxjuCAOXWm9zsyhH8tYGdNVvzktxXkn0JV4g19TEu4MisuhcIhqJyrSsh 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Signed-only Messages These messages are signed-only, using different schemes of header protection and different S/MIME structure. The use no Header Confidentiality Policy because the hcp is only relevant when a message is encrypted.
S/MIME signed-only signedData over a simple message, Wrapped Message This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a text/plain message. It uses the Wrapped Message header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:04:02 -0500 User-Agent: Sample MUA Version 1.0 MIIMcAYJKoZIhvcNAQcCoIIMYTCCDF0CAQExDTALBglghkgBZQMEAgEwggKZBgkq hkiG9w0BBwGgggKKBIIChk1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IG1lc3NhZ2UvcmZjODIyOyBwcm90ZWN0ZWQtaGVhZGVycz0id3JhcHBlZCINCkNv bnRlbnQtRGlzcG9zaXRpb246IGlubGluZQ0KDQpNSU1FLVZlcnNpb246IDEuMApD b250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InV0Zi04IgpDb250ZW50 LVRyYW5zZmVyLUVuY29kaW5nOiA3Yml0ClN1YmplY3Q6IHNtaW1lLW9uZS1wYXJ0 LXdyYXBwZWQKTWVzc2FnZS1JRDogPHNtaW1lLW9uZS1wYXJ0LXdyYXBwZWRAbGhw LmV4YW1wbGU+CkZyb206IEFsaWNlIDxhbGljZUBzbWltZS5leGFtcGxlPgpUbzog Qm9iIDxib2JAc21pbWUuZXhhbXBsZT4KRGF0ZTogU2F0LCAyMCBGZWIgMjAyMSAx MDowNDowMiAtMDUwMApVc2VyLUFnZW50OiBTYW1wbGUgTVVBIFZlcnNpb24gMS4w CgpUaGlzIGlzIHRoZSBzbWltZS1vbmUtcGFydC13cmFwcGVkIG1lc3NhZ2UuCgpU aGlzIGlzIGEgc2lnbmVkLW9ubHkgUy9NSU1FIG1lc3NhZ2UgdmlhIFBLQ1MjNyBz aWduZWREYXRhLiAgVGhlCnBheWxvYWQgaXMgYSB0ZXh0L3BsYWluIG1lc3NhZ2Uu IEl0IHVzZXMgdGhlIFdyYXBwZWQgTWVzc2FnZQpoZWFkZXIgcHJvdGVjdGlvbiBz Y2hlbWUuCgotLSAKQWxpY2UKYWxpY2VAc21pbWUuZXhhbXBsZQqgggemMIIDzzCC AregAwIBAgITDy0lvRE5l0rOQlSHoe49NAaKtDANBgkqhkiG9w0BAQ0FADBVMQ0w CwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxl IExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAgFw0xOTExMjAwNjU0 MThaGA8yMDUyMDkyNzA2NTQxOFowOzENMAsGA1UEChMESUVURjERMA8GA1UECxMI TEFNUFMgV0cxFzAVBgNVBAMTDkFsaWNlIExvdmVsYWNlMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAmpUp+ovBouOP6AFQJ+RpwpODxxzY60n1lJ53pTeN SiJlWkwtw/cxQq0t4uD2vWYB8gOUH/CVt2Zp1c+auzPKJ2Zu5mY6kHm+hVB+Ithj LeI7Htg6rNeuXq50/TuTSxX5R1I1EXGt8p6hAQVeA5oZ2afHg4b97enV8gozR0/N kug4AkXmbk7THNc8vvjMUJanZ/VmS4TgDqXjWShplcI3lcvvBZMswt41/0HJvmSw qpS6oQcAx3Weag0yCNj1V9V9yu/3DjcYbwW2lJf5NbMHbM1LY4X5chWfNEbkN6hQ ury/zxnlsukgn+fHbqvwDhJLAgFpW/jA/EB/WI+whUpqtQIDAQABo4GvMIGsMAwG A1UdEwEB/wQCMAAwFwYDVR0gBBAwDjAMBgpghkgBZQMCATABMB4GA1UdEQQXMBWB E2FsaWNlQHNtaW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYIKwYBBQUHAwQwDgYDVR0P AQH/BAQDAgUgMB0GA1UdDgQWBBSiU0HVRDyAKRV8ASPw546vzfN3DzAfBgNVHSME GDAWgBSRMI58BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0BAQ0FAAOCAQEAgUl4 oJyxMpwWpAylOvK6NEbMl1gD5H14EC4Muxq1u0q2XgXOSBHI6DfX/4LDsfx7fSIu s8gWVY3WqMeuOA7IizkBD+GDEu8uKveERRXZncxGwy2MfbH1Ib3U8QzTjqB8+dz2 AwYeMxODWq9opwtA/lTOkRg8uuivZfg/m5fFo/QshlHNaaTDVEXsU4Ps98Hm/3gz nbvhdjFbZbi4oZ3tAadRlE5K9JiQaJYOnUmGpfB8PPwDR6chMZeegSQAW++OIKqH rg/WEh4yiuPfqmAvX2hZkPpivNJYdTPUXTSO7K459CyqbqG+sNOo2kc1nTXl85RH NrVKQK+L0YWY1Q+hWDCCA88wggK3oAMCAQICEzdBBXntdX9CqaJcOvT4as6aqdcw DQYJKoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMg V0cxMTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRo b3JpdHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3Zl bGFjZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALT0iehYOBY+TZp/ T5K2KNI05Hwr+E3wP6XTvyi6WWyTgBK9LCOwI2juwdRrjFBSXkk7pWpjXwsA3A5G Otz0FpfgyC7OxsVcF7q4WHWZWleYXFKlQHJD73nQwXP968+A/3rBX7PhO0DBbZnf itOLPgPEwjTtdg0VQQ6Wz+CRQ/YbHPKaw7aRphZO63dKvIKp4cQVtkWQHi6syTjG sgkLcLNau5LZDQUdsGV+SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/2NKRu0BXnDe/ N+iDz3X0zEoj0fqXgq4SWcC0nsG1lyyXt1TL270I6ATKRGJWiQVCCpDtc0NT6vdJ 45bCSzsCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZI AWUDAgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQM MAoGCCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIGwDAdBgNVHQ4EFgQUu/bMsi0dBhIc l64papAQ0yBmZnMwHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJ KoZIhvcNAQENBQADggEBAHOJojanzqmgaSN3/gqSQ4cbbmdj/R40BEPr+gXT+xii dfZ2iLNwYyTneuK6AChwKfnNvOFb8lV1iffRTF/KtmVEDMR/sYeqAH83KM5p3el2 lVh4OHhyI0qNuz5oShNaACSioQ23WxHGVy9vsdVfnbhsplrWg9NQ2WbpCmK+2oMh 2oYl0Z/wvXMt9cG6jbMvcdH4z0IOvg6mrYkKTM/RCGnumghxwYToj1OyD5Gs4D2I JCw+fX5ODxh52MbNRYXTus2ZPRPM8JXNQC4GWv4km3M4rKnJDd6hnoQ9rNeozIcB VyybQYjfrgg4DRvw9Ksk22OH4ConlB8f7R7s1LM2cSYxggIAMIIB/AIBATBsMFUx DTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1w bGUgTEFNUFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhM3QQV57XV/Qqmi XDr0+GrOmqnXMAsGCWCGSAFlAwQCAaBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0B BwEwHAYJKoZIhvcNAQkFMQ8XDTIxMDIyMDE1MDQwMlowLwYJKoZIhvcNAQkEMSIE IPno+5X5nFLPT0q5vegHgVP4OV2/uzd4xPnLWkqhqYIvMA0GCSqGSIb3DQEBAQUA BIIBAKG7Nq53TFMHU6ciIcQ9Tqq987YPEVAIJJ23U+60DXrXSrrmcZCqd2ZTyhJn f5Wc8vBoC9tzRBoQpl0WMS3WyQQkkWYY+ovPyDqcEt3iixC0aVRWIZoDiq5SiWR8 lB9CUcsKueu0IG1xmdvCmI/wrODkDEgiSV0Z+d2cs/I+OS1FSNVosffsd4JhkTxi 2dD5BMCfa0zaS96GPadv47p3oizmSO9u2TIBCceD94k6iIhG0jl9rdeUmOunTKlb Odz6Y1TlVrb+s+nYGQUtOWWGulO854oCYjWuTi2TwzlBI9NrrMM6xR+T8JAxIkXx vKwjA1ETt2Nvp0OqVR9izIeeiO0= ]]>
S/MIME signed-only multipart/signed over a simple message, Wrapped Message This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses the Wrapped Message header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:05:02 -0500 User-Agent: Sample MUA Version 1.0 --8a8 MIME-Version: 1.0 Content-Type: message/rfc822; protected-headers="wrapped" Content-Disposition: inline MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: smime-multipart-wrapped Message-ID: From: Alice To: Bob Date: Sat, 20 Feb 2021 10:05:02 -0500 User-Agent: Sample MUA Version 1.0 This is the smime-multipart-wrapped message. This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses the Wrapped Message header protection scheme. -- Alice alice@smime.example --8a8 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name="smime.p7s" MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA1MDJa MC8GCSqGSIb3DQEJBDEiBCALOMrQogvVsAh7w8dZ49veRaAFhTQ49VmGVz+1eTbz tjANBgkqhkiG9w0BAQEFAASCAQA/IjhMNkM+NpI3wGfQyDClEMkiUG5SQ88JC0zc Xaz46K27ncQh+PW9TChvi9V9VR9EvKx7sh0dBnjhogrMTH3V1mZPgyL2HdsfLvXa WHmHQmbTnsZH8+kqOLdOZG/zbQMgR3sSv992f6ShxZNdazwGSf5s7Hs6+an6yy24 VtJqhT5xHHvMfDLUVW4sXwRugWKohiW+cjZ16SQ5zP14KJBpriMWv8A/4sJv5aC2 ImraEATJ1gIse53X6XPDt/+9BsXOrvbIvXRIbgMJBK8gIz6aO72n/dvm1fHjdBXv 9t75zqN+O821RiUiSbBoaB3FP0sl3prsZ4QRr3Yv7vpv/HoR --8a8-- ]]>
S/MIME signed-only signedData over a simple message, Injected Headers This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:06:02 -0500 User-Agent: Sample MUA Version 1.0 MIIMMgYJKoZIhvcNAQcCoIIMIzCCDB8CAQExDTALBglghkgBZQMEAgEwggJbBgkq hkiG9w0BBwGgggJMBIICSE1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVRyYW5z ZmVyLUVuY29kaW5nOiA3Yml0DQpTdWJqZWN0OiBzbWltZS1vbmUtcGFydC1pbmpl Y3RlZA0KTWVzc2FnZS1JRDogPHNtaW1lLW9uZS1wYXJ0LWluamVjdGVkQGxocC5l eGFtcGxlPg0KRnJvbTogQWxpY2UgPGFsaWNlQHNtaW1lLmV4YW1wbGU+DQpUbzog Qm9iIDxib2JAc21pbWUuZXhhbXBsZT4NCkRhdGU6IFNhdCwgMjAgRmViIDIwMjEg MTA6MDY6MDIgLTA1MDANClVzZXItQWdlbnQ6IFNhbXBsZSBNVUEgVmVyc2lvbiAx LjANCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNldD0idXRmLTgiOyBw cm90ZWN0ZWQtaGVhZGVycz0idjEiDQoNClRoaXMgaXMgdGhlIHNtaW1lLW9uZS1w YXJ0LWluamVjdGVkIG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBzaWduZWQtb25seSBT L01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEuICBUaGUNCnBheWxv YWQgaXMgYSB0ZXh0L3BsYWluIG1lc3NhZ2UuIEl0IHVzZXMgdGhlIEluamVjdGVk IEhlYWRlcnMNCmhlYWRlciBwcm90ZWN0aW9uIHNjaGVtZS4NCg0KLS0gDQpBbGlj ZQ0KYWxpY2VAc21pbWUuZXhhbXBsZQ0KoIIHpjCCA88wggK3oAMCAQICEw8tJb0R OZdKzkJUh6HuPTQGirQwDQYJKoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjER MA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2Vy dGlmaWNhdGlvbiBBdXRob3JpdHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5Mjcw NjU0MThaMDsxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYD VQQDEw5BbGljZSBMb3ZlbGFjZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC ggEBAJqVKfqLwaLjj+gBUCfkacKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg 9r1mAfIDlB/wlbdmadXPmrszyidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07 k0sV+UdSNRFxrfKeoQEFXgOaGdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74 zFCWp2f1ZkuE4A6l41koaZXCN5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY 9VfVfcrv9w43GG8FtpSX+TWzB2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r 8A4SSwIBaVv4wPxAf1iPsIVKarUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcG A1UdIAQQMA4wDAYKYIZIAWUDAgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5l eGFtcGxlMBMGA1UdJQQMMAoGCCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNV HQ4EFgQUolNB1UQ8gCkVfAEj8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfx CShlNhpnHGh29FkwDQYJKoZIhvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRG zJdYA+R9eBAuDLsatbtKtl4FzkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5 AQ/hgxLvLir3hEUV2Z3MRsMtjH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5U zpEYPLror2X4P5uXxaP0LIZRzWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGn UZROSvSYkGiWDp1JhqXwfDz8A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19o WZD6YrzSWHUz1F00juyuOfQsqm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgw ggPPMIICt6ADAgECAhM3QQV57XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUA MFUxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhT YW1wbGUgTEFNUFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEy MDA2NTQxOFoYDzIwNTIwOTI3MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYD VQQLEwhMQU1QUyBXRzEXMBUGA1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqG SIb3DQEBAQUAA4IBDwAwggEKAoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l 078oullsk4ASvSwjsCNo7sHUa4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6 uFh1mVpXmFxSpUByQ+950MFz/evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEO ls/gkUP2GxzymsO2kaYWTut3SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBl fkgKN5wXVgkWFfiOucfCn+IQsaqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4Ku ElnAtJ7BtZcsl7dUy9u9COgEykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8w gawwDAYDVR0TAQH/BAIwADAXBgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0R BBcwFYETYWxpY2VAc21pbWUuZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAO BgNVHQ8BAf8EBAMCBsAwHQYDVR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8G A1UdIwQYMBaAFJEwjnwHFwyn8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IB AQBziaI2p86poGkjd/4KkkOHG25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAo cCn5zbzhW/JVdYn30UxfyrZlRAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoT WgAkoqENt1sRxlcvb7HVX524bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2z L3HR+M9CDr4Opq2JCkzP0Qhp7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF 07rNmT0TzPCVzUAuBlr+JJtzOKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSr JNtjh+AqJ5QfH+0e7NSzNnEmMYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRG MREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBD ZXJ0aWZpY2F0aW9uIEF1dGhvcml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglg hkgBZQMEAgGgaTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJ BTEPFw0yMTAyMjAxNTA2MDJaMC8GCSqGSIb3DQEJBDEiBCBWJ1HsKaiXvrMR26xS /wrb+5CS85FLWuHRuKm85dkUFTANBgkqhkiG9w0BAQEFAASCAQBE/g/trAYogNeF 9oD6esBshX+oPQp8AhmTNr5mdEi+YCHauiO4z94lPIGHwPGGI220cly1C68bMsjT HPlaumv6zhotJym5OtJH1nD0cOxeqMSP+/htEgb/YmOTs1tGL5W6MRDE2Qpk+ZT+ skuKKBT98a/VQGEmyIZSTJV9SmiapvYDb9BA+KPuFZ0Yd/vMtTjq1dRBzadE9byX O10GDNMBiqOeDeVcfU2j/rb3UELfJqSpiTqEST/JIq1PvZHr+En2Z0PfMA7BKjTm sl/sczGLBObDAJztOOG7oU83zowcKn0JNse2cKU2eQMAENtuahfaXzVrmbfsW665 Mrfom9Z/ ]]>
S/MIME signed-only multipart/signed over a simple message, Injected Headers This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses the Injected Headers header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:07:02 -0500 User-Agent: Sample MUA Version 1.0 --f1e MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: smime-multipart-injected Message-ID: From: Alice To: Bob Date: Sat, 20 Feb 2021 10:07:02 -0500 User-Agent: Sample MUA Version 1.0 Content-Type: text/plain; charset="utf-8"; protected-headers="v1" This is the smime-multipart-injected message. This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a text/plain message. It uses the Injected Headers header protection scheme. -- Alice alice@smime.example --f1e Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name="smime.p7s" MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA3MDJa MC8GCSqGSIb3DQEJBDEiBCA6Rhu8s2iPcyWQk+TNKhP9ZHJ9+wulWjsMpAF1NXCE jDANBgkqhkiG9w0BAQEFAASCAQB4QMAYf42dnAelBRb2NotiixNgdjdSpVK75af6 oND3UjdCWcd4bPbrfTZMQKp0FBPoOft9lw2fWNgXwKbhD1cL3RWUmUq0zcNbI3XI 86vWp79p+KwM/+SyDdfgudIRGjbs/tmKaBvaH89a8SvuxhNxq/pxgDzpy/JWC8Er AUDTbKrNVsYD+MfzMy9B0TlK2YLKoQ6rV0N1n2nXbW0e+Ztv0a/getNKAEAP+5hE OQkq50RxUP9pI5kQ1NdU6zqCNhRjmd1wnMxn45K+hfY8cxwwemFn94PgDGpPG4mB yRXQPj+5oyduWiHRMLXG1+fs4tqxHZXN+WaUHvSIDqNXK3rj --f1e-- ]]>
S/MIME signed-only signedData over a complex message, Wrapped Message This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:04:02 -0500 User-Agent: Sample MUA Version 1.0 MIIQhwYJKoZIhvcNAQcCoIIQeDCCEHQCAQExDTALBglghkgBZQMEAgEwggawBgkq hkiG9w0BBwGgggahBIIGnU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IG1lc3NhZ2UvcmZjODIyOyBwcm90ZWN0ZWQtaGVhZGVycz0id3JhcHBlZCINCkNv bnRlbnQtRGlzcG9zaXRpb246IGlubGluZQ0KDQpNSU1FLVZlcnNpb246IDEuMApD b250ZW50LVR5cGU6IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjFkNyIKU3Vi amVjdDogc21pbWUtb25lLXBhcnQtY29tcGxleC13cmFwcGVkCk1lc3NhZ2UtSUQ6 IDxzbWltZS1vbmUtcGFydC1jb21wbGV4LXdyYXBwZWRAbGhwLmV4YW1wbGU+CkZy b206IEFsaWNlIDxhbGljZUBzbWltZS5leGFtcGxlPgpUbzogQm9iIDxib2JAc21p bWUuZXhhbXBsZT4KRGF0ZTogU2F0LCAyMCBGZWIgMjAyMSAxMjowNDowMiAtMDUw MApVc2VyLUFnZW50OiBTYW1wbGUgTVVBIFZlcnNpb24gMS4wCgotLTFkNwpNSU1F LVZlcnNpb246IDEuMApDb250ZW50LVR5cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2 ZTsgYm91bmRhcnk9IjQxMyIKCi0tNDEzCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFp bjsgY2hhcnNldD0idXMtYXNjaWkiCk1JTUUtVmVyc2lvbjogMS4wCkNvbnRlbnQt 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S/MIME signed-only multipart/signed over a complex message, Wrapped Message This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:05:02 -0500 User-Agent: Sample MUA Version 1.0 --aa9 MIME-Version: 1.0 Content-Type: message/rfc822; protected-headers="wrapped" Content-Disposition: inline MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="a30" Subject: smime-multipart-complex-wrapped Message-ID: From: Alice To: Bob Date: Sat, 20 Feb 2021 12:05:02 -0500 User-Agent: Sample MUA Version 1.0 --a30 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="844" --844 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit This is the smime-multipart-complex-wrapped message. This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme. -- Alice alice@smime.example --844 Content-Type: text/html; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit

This is the smime-multipart-complex-wrapped message.

This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme.

--
Alice
alice@smime.example

--844-- --a30 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --a30-- --aa9 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name="smime.p7s" MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzA1MDJa MC8GCSqGSIb3DQEJBDEiBCDvCBOZJKngosmsBz3B3if2ErlYiRyR1KnTpWbe6AN0 fzANBgkqhkiG9w0BAQEFAASCAQB6Xc+YUIEUCqF3vqlZTP41u/jEG33O+bc5jw7D VLUbKQ+AI6c6602LAgMwX17VuBdbgHecf59trY2F47Wr8NlcbTcAq0jN54tqrhri 8cL4YzS8YGH0vLrDdwilChjs0N1+t5nQ8Rya+rdGqseE0TK38P/K28cnU3udgTjb 6E/QcopIlnLaaji+x5qjRHql0Yt9tbA5F1L9vgqgu7Zf9w55tZIe9cESnVZpud/1 +zqsKDfj4ndnMDFzrUtXztY2e1f/Y8EVjSIVtY+ZeYuldtGhPpvk/N3koxZ1yL2Z mrPQemZ0C2bIet7T1vv7lFCUtUObdyHoHBvXI7OhbCmGmak3 --aa9-- ]]>
S/MIME signed-only signedData over a complex message, Injected Headers This is a signed-only S/MIME message via PKCS#7 signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:06:02 -0500 User-Agent: Sample MUA Version 1.0 MIIQbQYJKoZIhvcNAQcCoIIQXjCCEFoCAQExDTALBglghkgBZQMEAgEwggaWBgkq hkiG9w0BBwGgggaHBIIGg01JTUUtVmVyc2lvbjogMS4wDQpTdWJqZWN0OiBzbWlt ZS1vbmUtcGFydC1jb21wbGV4LWluamVjdGVkDQpNZXNzYWdlLUlEOiA8c21pbWUt b25lLXBhcnQtY29tcGxleC1pbmplY3RlZEBsaHAuZXhhbXBsZT4NCkZyb206IEFs aWNlIDxhbGljZUBzbWltZS5leGFtcGxlPg0KVG86IEJvYiA8Ym9iQHNtaW1lLmV4 YW1wbGU+DQpEYXRlOiBTYXQsIDIwIEZlYiAyMDIxIDEyOjA2OjAyIC0wNTAwDQpV c2VyLUFnZW50OiBTYW1wbGUgTVVBIFZlcnNpb24gMS4wDQpDb250ZW50LVR5cGU6 IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjM5NSI7IHByb3RlY3RlZC1oZWFk ZXJzPSJ2MSINCg0KLS0zOTUNCk1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5 cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2ZTsgYm91bmRhcnk9IjkwNyINCg0KLS05 MDcNCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNldD0idXMtYXNjaWki DQpNSU1FLVZlcnNpb246IDEuMA0KQ29udGVudC1UcmFuc2Zlci1FbmNvZGluZzog N2JpdA0KDQpUaGlzIGlzIHRoZSBzbWltZS1vbmUtcGFydC1jb21wbGV4LWluamVj 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S/MIME signed-only multipart/signed over a complex message, Injected Headers This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:07:02 -0500 User-Agent: Sample MUA Version 1.0 --f91 MIME-Version: 1.0 Subject: smime-multipart-complex-injected Message-ID: From: Alice To: Bob Date: Sat, 20 Feb 2021 12:07:02 -0500 User-Agent: Sample MUA Version 1.0 Content-Type: multipart/mixed; boundary="099"; protected-headers="v1" --099 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="9a5" --9a5 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit This is the smime-multipart-complex-injected message. This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme. -- Alice alice@smime.example --9a5 Content-Type: text/html; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit

This is the smime-multipart-complex-injected message.

This is a signed-only S/MIME message via PKCS#7 detached signature (multipart/signed). The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme.

--
Alice
alice@smime.example

--9a5-- --099 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --099-- --f91 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name="smime.p7s" MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzA3MDJa MC8GCSqGSIb3DQEJBDEiBCDzzjU9zkYamvSgC05wewF4LgTekLa4P8khUZ1HRNkO GzANBgkqhkiG9w0BAQEFAASCAQCFAaiW0MVy2tnagCpthNu6sAL22/BBu2BS5XY0 vTH4/MtLzU4lSokfcs8lgpXmE852prfBZfyoBiOtKZF6TkW59XPiEx4TfBZ+pFwb MaJbZ5Kil2GpqKib2sEKbaNHaUY0H+vixz3NP6lo2Izras33cw4Z7FE24qs3zTAA 1WYTF8rtPhXVW9rFLumBOF8LgGKPTh4mjWrAEcaqqmscisibxTJ5yp5DJhHMf9Xv /HVi9lOJJ5BlYOQOL/jWPxQorYJAP62HwEEzz7/GE24hm43pK8uHT5DPHiG+gZZL 35qcfe8j50JVLTG2wcRH/aKhat12MMnPFMqnJGwugLv4rwg5 --f91-- ]]>
Encrypted-and-signed Messages These messages are encrypted and signed. They use PKCS#7 signedData inside envelopedData, with different header protection schemes and different Header Confidentiality Policies.
S/MIME encrypted and signed over a simple message, Wrapped Message with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Wrapped Message header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:08:02 -0500 User-Agent: Sample MUA Version 1.0 MIIVvAYJKoZIhvcNAQcDoIIVrTCCFakCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAH7NZ5T5anffqtWAgtooMtA/krAJvMnVSghb 3dWk15izranm5qH2EdFCxvdagu4bsboapU7GH2o8sZ+Hr7ExuiAFRSoQMS/wgOgW VtfwjKSoKYqQb0/jxCKMtDGqfz1p5qBgNAz7GLEkC/P+PqYNHJrwX2ddrlHJ1O0G 6ut7Qjgsv03UIxSO9IZ+KwsnxuPko5AuveAifbOyN5zNA/yNGWrdVsLFboz5sD1Q uyI/cWctTDCLvoyVtBRkIWRUJlHmgB8AlFoT2pBRmFCExx1NK0IG2xlDc/K8K2g3 LTFEoderXpcOY1S9WuXuEGWpYFu//Pqt0kmAacfbp8DbF/KL0k0wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAPLsdF0Kyueyd/ofoyTKriNDH mh/Nr7KhbiqQDRZpJ40SL2QR5Tkt95RZ2FcHOmP8QVRoCMPDfIY7tXXVxdaCewju 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S/MIME encrypted and signed over a simple message, Injected Headers with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:09:02 -0500 User-Agent: Sample MUA Version 1.0 MIIVbAYJKoZIhvcNAQcDoIIVXTCCFVkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAE4jHFjgjvcL+vJbAAHC/TgYkD0lhFkLlWZh gSxqqlgjf4wieoJudnfk5t9FO9lLxUqqrqFCOoR7MTdQMJhgmcsb9G8ncJoWsNsO EZ5Fdt/rrxHgtjXJodVbrk0BOJ7L9GVfzQBPFdwKEg49vP6+sVp+CGmByXvdlA54 ueZCKs6SK2QMzodp1nJws4IXm7BIaJsvGu6huNEI5lNe+NSl9qAGej+oJn0i5vsa S/2H/0fxS81sIBfY/QYRr8AAb4lbFltWRWfQgix+kORhltIPP4A7Jo5a+fA92ZCT HpFER/cZBLpalp2M+HVBajOUgASwsA/Y30Y7Sj3kXqE37RvaO1IwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAEBy7Zg8b9DsTrdlACEAgiB5r w6FQ6Bugd6UDLrGOmyCSZ1KoCmPUxpb3veBdbYTrjSIuhkMYq0/ZUQ7JVS4jgFMe 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S/MIME encrypted and signed over a simple message, Injected Headers with hcp_minimal (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:10:02 -0500 User-Agent: Sample MUA Version 1.0 MIIWHAYJKoZIhvcNAQcDoIIWDTCCFgkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAA7foZVL0cKGxTAGMEqr24xmXk+R9+1tBvxo vVC0FR62j6F3bEqRPggJoL/HYhvhbCluNzS462O1GUESTn6dU0sFnAtHvpm/aggs ywFJsWc/fzzIyEN9wQ5X+2BWM9SofTEikdGaUUz/fub8KpV3ZHmpO+boNOMRWys5 gOR9GFt+iv5LEdqhvaymsdFs/qKAZBZo28ffE4DsanZEVmYufMriwoyRtyqnHD4A hmihNTH5ZCdeUUSZXb0w/UP9TWlQ9C3m663fywaS1zUNaol4gEpTcto76D/FohGk s9mZ4vFcBgGWzH7GJWJFWE4VRCQoNiWC4H8y+wIqfIDE9d4isEMwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEASY3CY6TZFO/11DvnkCjzRwpZ S+1JJ7S/t7cPtxZxd8ZVVAmNmVEvYkcXsCNbvUrTy2BlVFWYKuPOOvfXQVHhK4PP 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S/MIME encrypted and signed over a simple message, Wrapped Message with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Wrapped Message header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:11:02 -0500 MIIWTAYJKoZIhvcNAQcDoIIWPTCCFjkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAIYa3OenGvm2fxVDHCD1/mOK+G0pkvIp9vgH 9ie1Xt9FsGcfZkoi6msDh/Td2ZLZXWyP3RCOcqvwu3e0M6IEbbWhFVAdgkfJ4k1a wlfIpe+ECDsja7I4rP2Fle1lPelgQ0yw+pmG/epN9Ga9FVvfKhDTHm0Zr11mNjIO FRuTtU+G6A+hQJrCz+DVh/3ub7P1DBomlG+bL8PIcgSzVwigtc0Hh905uZWb8ypd CE7R4SzQfX6u2/I/9K7FgZ9pSp8zZpi5WvcBuJvSqeLgTL08mm+7AMAYHEld005y B5GFc9fTTV8ByI1eLzvFK4xl8EnFeQNVtcpoIuJ+BxAihm3OahwwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAhCWApyit+JqyC6p1+Y2mE0rR LziSUeCZ72cLwSS2GXyl4YE86WTYQPgF5IHUymyTwtnqyjKZB2DUP4jOCqOOuHJQ cEVy+uO07cYIp/K1bZY3mKy5EQkdlo6qpOYJmIs03zoQfzYb/5FxBBIhudMqB5U0 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S/MIME encrypted and signed over a simple message, Injected Headers with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:12:02 -0500 MIIV7AYJKoZIhvcNAQcDoIIV3TCCFdkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHDjf6b8nYADPvM7jm6fi20/h20vJSvpXabk JPChxwLJxY3a33r0vWwEanKZo/k1fbkxXa7w+FqMEEM/3EsktY3BgsTBDC+vN2Dx 1/hX9wBNi2D3emJnmwEv8vOmNxGeg+P+vZN7WjM6kqVrUgEyfyRkzMo1o8YNaFgB F/b9ss3PjYUEkN+k+Oi1Pyi3GIxPw1KoYyO4LXX4QQhTFOIje7b9UOZk6zeoz1qZ sBQjrOnh2bKeSENwgaS+61RvS1FKweluIyE1OuUUvx46WQXVJ4czZmdnSORW0+nD XbSo3Um6fzwO7Aqqbw82qHcg7sGhQWhbA4F2Ud2aM8p+zviUEn8wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEARXtsiPCj7mfzszkuZ4d+30YF Q2pPbJbLfhl6xEI171WNKwmLMtWS10oQ4Ojmxw+W2/yJCMtUbIr1gXWOlkW07ln0 ATq9WCN99ipuScfQ7mfB1AsCelAoxbEzGtrNX3IInAk59oN21SKltH4hd3UCULlo 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S/MIME encrypted and signed over a simple message, Injected Headers with hcp_strong (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:13:02 -0500 MIIWnAYJKoZIhvcNAQcDoIIWjTCCFokCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAGXrH1WNm/k3nn8sEvr1NxWi6vN9dWkgNKBk uyHpuWbmQxgdsC4i0rQBk0W4XOaDdu5yYwt4uzqqfbIlgJQRnFfNt5Dj0tx+Wqxs /uK0Fp8oCFZ4pJQVyX4idSfWvbq6J3iTIA0cPHBogIE4y8mMuByXh97VK5IGKvXc RDYnE9vsYJY0Hpm//5ZUvUcNa7PeIJmrv/eJ0kjxAW7pa/64ni9T5qP8BKHgvcJm YFYS6zy4UMjRNEftjlGNZa6QElsy207BIZI3Vp3I1nvBCZI/Y6IHyN/Z3dKLG+Yp eRhvtvF+PO+YeOLjm+o76hCIkJx8qqg3EYLV8dbbthK1aDgNO2swggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAbVIWhJ9+bVLKFMdyq+QNi1mn qFxMKKidulH5s3NmRCYn9/nu82R8k+r4+FeVv+mrIIH90rG6v8pJZDFUDkG270Vj v+ZmqsJLTuV1xsS8p6sOi/1sdoHC/GBLUffalroOJhRJ90aoSYnM5b9h4hWxYFi2 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S/MIME encrypted and signed reply over a simple message, Wrapped Message with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Wrapped Message header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:14:02 -0500 User-Agent: Sample MUA Version 1.0 In-Reply-To: References: MIIWfAYJKoZIhvcNAQcDoIIWbTCCFmkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBADEgUQKlrg2+/XSX0UPb/Ei3BGHV9bPdcdb6 9Kb5AzgrFjXl62h75z9kr7n7laGQIEvqVHr/93cOMCfOrmF4Q1jiQC2HazguNuQW x9frIxOQqKnSf6rkeN/HeMp/z+ySEn2rAD/zJxQkqcX6vOLCR1O2whuQzkCkWSun vgWYeyOHcf7tbf3u/FTAZkBW4lfpA6vBgNXG9ntspArT1OIyI8sworBZho3nldHi Y7A/02cARB7jVoueV8YhcAs4QPGxNtpseWHfQn1ISTT+SYc+sBmmdznvWo3w9a+0 HrXHwYaayfJ9iH9gFLeiBGNC6yahQXMbgzxXHfFw6wl0LvGe2NQwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAjtCbyUK4xtTg8t0Bw1L16j24 DjRCQoOLLhszshjDrp9pnOh6s1QJv8VbzDevogdYjAqPWdrDmk1tuWch2OBIVjtv 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S/MIME encrypted and signed reply over a simple message, Injected Headers with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:15:02 -0500 User-Agent: Sample MUA Version 1.0 In-Reply-To: References: MIIWLAYJKoZIhvcNAQcDoIIWHTCCFhkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFd0ZCRsgbltPZeKwiWXdgr2zAIdA97BVi70 qi2qyF9MtDCkjE1VWu9artXd4M220u4iJKEHTdBXZ7jbhI852ljKnn4JsClo7OqH S4F5NeZyaT8gX6LCnL/2z9SoWJrOIa28eSF7FO/vwxgzBYHtSQBtUzaXjimb6BQx TVq+GrpOiE+QaWzRTmip/sgOfiGPQBSJPRJiIzM0NIQhuc6ZeFpDyRz5/EK8Upuz kOaQZhpGBAq6QeP13CxmYYSk4jnnhD2AjxRGscnonaluELmP4moEnc/SOLAkVHwj 7wEdCG+PumR5Ni1Jf/nxeopZKGYNWva7zQDdTqGdMIIIzfLaA9AwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEALks1aYJrPOhzZXHz5t3vIx06 ssGmUbBL7qhD4quYbIx7rjyMPQ55uKOHih9F7PoSzE35IbnPLQgkDTs4ZtaVXcM7 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]]>
S/MIME encrypted and signed reply over a simple message, Injected Headers with hcp_minimal (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:16:02 -0500 User-Agent: Sample MUA Version 1.0 In-Reply-To: References: MIIW/AYJKoZIhvcNAQcDoIIW7TCCFukCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAJDxg4GjNIIaOr9Kf4xVYzLZ9okfUMbBaiZn ecCbmpTZbaEOu7Lsxuw+MirounSBPZIeG3keg/uO0HHo9r+kHDt2wq97StpAQRTE Hb9sdS0xHiGYiH2vpgtIInNztCQQduzOHBzbGtQWa1KG+DoaGp3jzqLp3yaP+o4f BxcCLcNJIxn7I+H04wSWHE9jQpaguk/2SiGzUZxr+KMP+0HFuYT4l+72cOVcAAXY p73P8kiMMj27mf28SB3naBDB75+fwsgtcrfqOPHBCIXwyKnGpJ6vmKvFvEzAP9kM oFQGsi7dBTzi+MQBtg6EfxgHhJfGtcHfE25FlAJJj3o9SbGVEV0wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAVQdgmLjOaxQWmpnLHXA3Y2Zk ZWxNCpmIwmiVM5jvuIjRsU07QcEkLYXVM1Jx6UbJ5A5olBUM9719poHGSPTP+bv+ 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S/MIME encrypted and signed reply over a simple message, Wrapped Message with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Wrapped Message header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:17:02 -0500 MIIXHAYJKoZIhvcNAQcDoIIXDTCCFwkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBADm9A/Lp5jfk4RN5/fhwF4iuuVOef9Jr8ed4 zR65esdHuxyfoM+gBpdSnrLZQ/0uWwXFKh2ORkofXO+K1qm+UaYbOq5byHwddP+6 iNP86nopcRJpeUNqsbWCSWr+niLbjxfZyJX3brf3+ckwjgo5+gik4wePBK1c58Ks DmRWbl16bqYeCReIFAHJNXd9dpGcUkyI1NunHi9720uyDqOvmM11xarP0Qalz/Au /D24dDevouDo4V6YGvbQ0Xy1rJ7DeIowrlqAq3t5+NbuZZPgDDQ/NdmLdrQOlsEi 0v2M820B0uM9L/6nO3BrFw66CWOx+PSAwrTNRnWLP68+XVJaHBIwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAm/DOeCI+Z5umxSECDJc8oKbW cicXtQzeI2drFZVX0d0QNvwKLXKMM0Jt7MzEjnYG7J+LKI/VbVJJ1kGJ0rDEYNZe 6cb8HDEW3TJxhB4BMf/offnCpOgwlE6+w1p0h8vgAZsPW/dFSMQKpjU+p1VabchR 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S/MIME encrypted and signed reply over a simple message, Injected Headers with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:18:02 -0500 MIIW3AYJKoZIhvcNAQcDoIIWzTCCFskCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAJcdIoUSpo1n7vGPkIbII5F90QJDgjFBWqN8 mrP3eorKCd/HmE614/YrIqI4MD0rcJBkd6xNbUeBl2z3wU9w0tyThZKAxZH8XkNw ZZu1aA3MRM+wqwCnxfJTSaZjkIMhsMe8U9ROY7InwRXqH2O0QRqRU4iJpIe5/DUH dn/70YqO5g0HOGjzWS+6IoQdiHf3eSU40AlqNyg0QQT5CP1OM7aRXxt006GWvqLW Lq52uimRL8AanDUkrEsOh1DggpFwsn/kTkOq9eBrjgNA8wHDA1BYfoLBHJQvn9yd ivkXnsjIqoaBcx/61TLrP97dn2v4STbiZd3LDe/8yBCdnOv08qkwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAZ09H8ZLLO2dMDjR2ysuZrqyi j3KqVh8Rq7uzjB+IKkzFfun3FxVZlUAvIwb1Pwrt3lFx20ekpF4PzC7x9sdbxWJ4 ZJKftmD6sMZ7DVeV5GABH3ClO+aY1MWs10Lq82S1TBzwcJZpKf5srR0QCuXaQq76 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S/MIME encrypted and signed reply over a simple message, Injected Headers with hcp_strong (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a text/plain message. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 10:19:02 -0500 MIIXnAYJKoZIhvcNAQcDoIIXjTCCF4kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBACIQq5gYVGjxS7N/umioYGQaBDzYuvtRP0wn 3/iHOuNThZd19MbrcaWCYkYZfrFFpAuqpVCPZ8mtxHrijYN47vAQUV6uOSDoZYft drJZYTnB3yuCJmfeS9zonrI+CYksfA9NwkFJdyl9b0ILw7tVf2QFEqX/5tU+6o6b NEoxlwp8I2+tICsm2oXq7rLZq9Wxw72pyV9OzNAwajOQML1nvPFyV7P1nB3EY6K6 3Mcx5TMplYEYEQ0sDzftTXfsau2fbQ756q1myA6aa344Y6j/oeUMeOuuUx/dQJMy BbvzzmA6bLmr1mBkuSJRher3NNZkY5BlYpziXXlzrdkZcClYAtcwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEADTrdvyR85I7Vq+f9+ow8LIO6 6OgE1Cs5YeDyvYgdYW5xpKbd/WKj8IbrUqN7ucVaFEyGjP9Iruf74Zw+MA9CO/iZ SDn+UiblUlWTqtiWx/4m8ZIkEkh0CgcBNHJT/ZqIF5WclQKqvxJGGUBlBQBhJSd5 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S/MIME encrypted and signed over a complex message, Wrapped Message with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:08:02 -0500 User-Agent: Sample MUA Version 1.0 MIIb3AYJKoZIhvcNAQcDoIIbzTCCG8kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHpthaX3pLTY1dQEpjs916ELlnCWjEQaqMJC b7U14ds6WpcbE+m7YotdmTDc6sMudcq8QWt13YfuveYJMPp88TnfLOJlmxvh16zM pBvxeDudVMaVk5AhRsIDeZy7XejbTUQbLvKNsfYaWpzcFQgw4pTbSj8adkH9ktJn BpOb9B1gknnHni97slF+6wc8y6UClQmwSV6M3rFRhdx/QIT1Y+JsO8Za7ByfwWzZ 8mgmKCW1WhQKutZUZes335ES6TFg/rXQwZfC/g3K2gDVWQJ2KOGoJfd+3gV8UhG7 XGwzJHn2H16D0+ryfmLqlEpdpH/n7lxL0etM9wJmyXGCbxNfODQwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAldsl+A7Bcif3coy6a1u5rzdj R5dLE46I2ScGw8LvTkwXyGnpR4KoNvWvkQLJ7kbXAYLg+Td3abYLDxibz4s9DqLs 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S/MIME encrypted and signed over a complex message, Injected Headers with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:09:02 -0500 User-Agent: Sample MUA Version 1.0 MIIbvAYJKoZIhvcNAQcDoIIbrTCCG6kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBADkVMpcJRfEa4tT386C5ia35Oz07sK9g9yn1 vdGRpk9pUDu1dIeio6wLIzCtwl4TtjfxJ3m9sEL0KDMSszkV0AANUZwxl576jpM7 qEl/7d2D+WXVGAI56Oe6ihINfrnPUJmk6BCj2Vk9918mX2FaDTtCQsVnrK/gDNu6 c8b8uJJbjeqbuDN8cyhATJA2+qSl/Fhoxieu2uiYU2CRjTfGELUOB5ReaksOxw9g ICfc55w7fuiIpTo7egwLaPaA3m4yUGoQSfoe+FZm4tCpsyIufBR3YXRVmPFMS2Qf k5G6ZQnLkxynZ3SEy+XjqO4q3HZS+3ylb3ikQlo+7umpZI/eQ3kwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAafaf6lhcWl9exMGYiSEijqEQ wFqMkjInWObOGS4Tng36oAAiGiLJ3JBV4QEgcjr/FhJ6A1HeN/LFxBMhYBXiMrqm 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S/MIME encrypted and signed over a complex message, Injected Headers with hcp_minimal (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:10:02 -0500 User-Agent: Sample MUA Version 1.0 MIIdbAYJKoZIhvcNAQcDoIIdXTCCHVkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAF3P8K//f2QuFu3CB1QYWA1UVOKdVUefYICd TG2PVFlsq76rPSChX/WA765rYh7rlp7cpKSvcuGYkLHxA28CXiR8i77ZCcoxFVVR vOqPGTZZ9eoNvpYa0qOai6KVhkRbGTwyXC6mi18N+Sy6tLCtR96jSLi8k4EDtKJs v4cCrA4QRDEpNFyzftj48yfjhKCBZSjnlPSeq6p5RWl32SFKGe81k72ez4VV/pzK idOG9ltviQ1ffeRFlI71VpEQov3fKCkkxCo/h1DilcFAo88o7TMc6U8DwiaMr8x4 rQXB5S8uBJBLNuhrdFiNIftRM2OJp3ij5DM3YRBoUvnDaKfiEMQwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAGuRE7UAzm9ElVleX0vu8IXiY vh/9cLBb2MVdmWGKIwHthSLxiZA5X64VxdGjFMlZzPanUhhexMLTZaP3ADx57dat 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S/MIME encrypted and signed over a complex message, Wrapped Message with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:11:02 -0500 MIIcXAYJKoZIhvcNAQcDoIIcTTCCHEkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFa5urZzuujCF68lwqMjpt5q6ecCrubcxfRW ufCpLVF9IwsK5B8mBc/Y1Ao1Izm1ZLHe71vRftcPkO7APU/bkaJ0YtXyElF67P9c AvW8XQRf2oDHEYgVerva1KvWDxoCDgyBXIGfaD1wjaZKs2nAM4fnWfju+d6zcw5q uArKn+BbUI43ryuHTDiaurzBwBEUps64ZyXNjP73X3xSlYV58OfftHQSHOKoPHg3 zebVKPSqARhugLWk06GxDMXAEjYZZBqrrYEgKNANwQllu72bFkD4gCXm4kIc9ezU ZDNTctiFc1ShGZB4Kdmrrm66ogsxJ+Ecvw4YVAkWbJE4+eV2g5gwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAKQ13b9qWHas/pyz/sKKJKkkz DMpP1zOvhEtFBfsUoKvSrgDwWgmKhO/V+B7abpEzibR7I4rAadHzgU1wfbNf30cb WqcCmyj+YA6w02rB0+y9X/SazD5+fmBwbDJnMWDXnggImy9xXrLjTl+7gII2J5Y0 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S/MIME encrypted and signed over a complex message, Injected Headers with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:12:02 -0500 MIIcPAYJKoZIhvcNAQcDoIIcLTCCHCkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBADPyejv9Q41LGeGoBdDpNDv6uYtRx1aRJOfn f4sbWXr4O/34962uv8O3XkNQUPykKKYZ41bEXBUU3enu5MvV/CQIbHYBIxhYmAMD vrw41JyVFN+yH53wtubTwSC8poa2TtjNv2S4nBgbsDQBbN7IR/DHKqCbUK7Am5t1 uuSHgMWpZrcRkUmBlkkqYym/kYfK51FnZbMSODJESjwQOrdhXJqv1RJFG6T0kw2a GOTxsg7spf/dDxEyNMnqm5tLOArFLKOBOxcpbJBPTWumUyKh2P+d8D/8pSGW351u SVEfw5Zw4zX5klwBKLVowk07vI3oSlu5DKfQJ/5WOBucU0EqDGIwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAKK12BJjTcV/7qS94clNAH+Nc slgE+RXD3UJ4VQM1fu/X4uszwrQtE8eWO/ToCVp/g+WSFZIzDRBfhbv/7rFDF1s2 oRVHpoZrO0sUrB6IQB7R+5WCueJomWRjJYbjbAcFSuff3WzC9sh6o+hu8p69lnJm 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S/MIME encrypted and signed over a complex message, Injected Headers with hcp_strong (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:13:02 -0500 MIId7AYJKoZIhvcNAQcDoIId3TCCHdkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFyXL5Bdsrj47hCSCMZg5HssJuT0Wkfqzrt+ Uauk+xOG9fu/C2qZFlc6itV0sTYKogOf2UOEetIXbj4ad9TeExHOn3YdEbbKBp0a KnYn5zyuaRc2VmBGwCrAcPaGLHL59ul93+Quyvp6t6T7L+y+rvgtOh6tMsCH2yVp TGUj2FVg6FxB4kg63f1FB1ofpU10wSB8nn+dUzUqxD/Pwvt0yxhB89ea2+3C4ncH 36wQPHM71la9981grPRH7RHBcWdyvny0LPipQ8v9p8bweJyVQ4oDqLdByO4XuNzL XqZnTKmhXugkRs2pShYJa9P/YnVf6fPhc9mlzl2R0UXZ00ezMZYwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAiAf5NTfAC/vD/MMeOHO+9ciT ntt01b98dS2zwaGnUR9B567tVQjWS+hXSWYZ7BSdp4Mnt1QyeIsFadrHZp9RGnXS gxfzpCBQm640OPesyumvXNwJnjIsgFScVJ2cfyFhdH8DM8yKCdBZc1ueiaTDTHXb 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S/MIME encrypted and signed reply over a complex message, Wrapped Message with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:14:02 -0500 User-Agent: Sample MUA Version 1.0 In-Reply-To: References: MIIcvAYJKoZIhvcNAQcDoIIcrTCCHKkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBADCscHA3WYayfDB0SnAjLLRn3cTsjsbLknQh iSnryqFniP70VlHS0exfVjnkyz5YxHRCrqLuXfV7EB4GRaieVzIkQTUEnhfBB+oM jXJzEZWi3Q/O3b/5AMsV8vks+gCf3eND5y/dxgFuzgTrYbE+M3XsfkiI4f9MaK9G 96uzaT0E1PLOCwQYUuWtPCffle484roJwg4++H+jWYpGvWhM1fGUu7dbNX779ErA pAMmOS4cywx9W20uczJ2Vzaa7OAEbgXrSinji47uAMFNVb/g2toeXlm4bITvdjd1 JhBqQoxgIGdVLfmxG9aZzKIWWF9D62cEdnyCu/t7A2knMCPkAqUwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAedVmzC4JhhBlJEdXJ0NgpV+6 StlCpr1ktO3ukPWbOBwWuUoMKcyt8aCN+XHtdVUFNqSAqJPHtcTGjq9JC4qUn8TY 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S/MIME encrypted and signed reply over a complex message, Injected Headers with hcp_minimal This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:15:02 -0500 User-Agent: Sample MUA Version 1.0 In-Reply-To: References: MIIcnAYJKoZIhvcNAQcDoIIcjTCCHIkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBADE6mU323yt3WjthHoiqYZZ7xRs0RSluUkr5 I1v1OlSNq5YQ95dD5vNuhMvjt/EtfgCJ7AO3aJNaldxCo/jIwbq5I6odTQZ7aEWN BkZ1KMHtu+gDoczq+jPyGvpYXl4x4yUtSwbp0I8nm2VMoYvNY9nBaqaXuraOLnGE VeqcJ0lh+hkyb0rcx9cxLk92xMk71/HQK4lYD2uMSnec26UemFmvSbijnBoJqqhi wDG/iUN6/7yO5UYnku7+66Ub9Jj4pdtjMXAyF7LvVBNcQ4L+aXMFJQQTJ0K6Rfh7 bgogVv/ijZtSRmB6jKJZ0wHruSgKIGFi3GdUhFxf7URV+Xc6/QUwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAc8xsqG6RvJzmyeWC4l7tECW7 cLRsPjr0ZP+NZ9j5BjhHOOA8KUh8deF6zC99DixeMVHxTWgYETK/yAKR6VASWglZ 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S/MIME encrypted and signed reply over a complex message, Injected Headers with hcp_minimal (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_minimal Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:16:02 -0500 User-Agent: Sample MUA Version 1.0 In-Reply-To: References: MIIeTAYJKoZIhvcNAQcDoIIePTCCHjkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAGR5655q11dQrEn1+qj1lo1Gr+bLsb6vwGIH YA/sZqZfUPrdFQZRoIqGr+mw9OFYhsaTjR+ZiK/19IZJUDSXOIqAN02kCRaLbe1R 822KrjNTYSKYNUI8mEMu1s8Mm/J3Rf6LDss3ZgcKKxDg5XqDtBG39VFTXgHVq5p5 xYKt88FM1CHe6oMOBVnCEKLu9aNm6iaQx/1IPGUYpQfEY1VEFHEyJeD9UenyYR+f O7UYzlXOk0l79OlIxspqqbRbehwsCVirzy9XfDzWFc1Al4GTtMp8n+7wm7BchMX/ 7S86+FiypOQFv/nHoeEgE5Z4Cfm/m464/q86fJ80tv4iTNQ7mGIwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAIK+kWhO1GQu8sKhJuZfl1zGB 7uDFNxt/SEB+I31lUgQJuK6BjfXoFhDy0j6Wwi5KFfCOGip5PdSd/UqLIdl0TJD9 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S/MIME encrypted and signed reply over a complex message, Wrapped Message with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Wrapped Message header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:17:02 -0500 MIIdXAYJKoZIhvcNAQcDoIIdTTCCHUkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBABOfkRzWpe8+giahAB4aK4FyKBN6535VHc1c 4f+nf8otkhBtrdwQfFeOuErPGeHzRvmDmaMtJFf1J24hsbhV4RbQ+mbxJPxoqKT5 qOYSj218aZlRvM4E3Y5Cy8i6iFGDOKBVSc+RHv+UukIOs9MhLC3K/Tmf64MQKYL5 sGAepPWv36xSQR3VSrmioM5SuozXl892mtuk207bpPiTnXXs4LHCgZptWc85vq4S jtS2AKUMUQOcUvyOoK1qQsERyy5BfkXE9jkjB9O/ba/No5LUBnhfhyJpmnfEeU2F JB1dGcO7drxF3FQNHgvj49IJHYEXndC7L8LkDvL+vh3XSTvedLAwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAqPKO+X6DScUv9t34OnIzHRne LvUyO32lwpOwyvc6rFSLrBto/WGpAGS9NQBGFlk7roGzXH3BTMnzpF/sFj8rntQT jHHqm6Cqvam9gBlnyu5/tihN9eHBCjF8M6OYksj18TomW99tm3KADcoe3AvpEOEg 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S/MIME encrypted and signed reply over a complex message, Injected Headers with hcp_strong This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:18:02 -0500 MIIdPAYJKoZIhvcNAQcDoIIdLTCCHSkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHw/91uDg1fJb003YLEnXot6ooUedmQUuwrV 0+AAMXpx+Ag22aGkQndo1Enr51SPudU674Rqcmd8GhOYv/SN7k2hJHcVJlNB1Bqk KBlndk8OZ3CmHiV04gDZUaH0CvHsXFS/SV2fixL4CuPjl/KolO1AFuOU336iRXTe cxiI6UL/n/feSVf0HNqSFgdnQs1/3pQIOA/33mSJBN9gLsZIohefKGYgzhjIO9EU T3PKk7A59hZhZiso1DMUSnuHOMRRHGbfPK1e9mMe3s/H8LXkqRXFeb9Dvme3R4pC GHEEsT4zJJqOTwYC2o1qn83v22k1Tych2daG/sMgDp+1nYV4KIQwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAPe52qnO+vt6h8MkYH5DP9GdZ UkyDSFBx4fkz1m1OivGHVrmeMAacHrU0EIthagq/gIoX3VL6+t0czMIm+l9svu3a tXUyCjDjOFS3gXmlwxg91rYWunzlMj7sMBRt3RjvZXUKhluL1kz3f10J77Y9GoG8 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S/MIME encrypted and signed reply over a complex message, Injected Headers with hcp_strong (+ Legacy Display) This is a encrypted and signed S/MIME message using PKCS#7 envelopedData around signedData. The payload is a multipart/alternative message with an inline image/png attachment. It uses the Injected Headers header protection scheme with the hcp_strong Header Confidentiality Policy with a "Legacy Display" part. It has the following structure:
Its contents are:
From: Alice To: Bob Date: Sat, 20 Feb 2021 12:19:02 -0500 MIIfHAYJKoZIhvcNAQcDoIIfDTCCHwkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAAqBquNyGXBsi563D5scoeCEhSWiHeZcEBof 53CMvSnOVtdWust0R7xoMAJyq8ZDsQ/rIWOAvgm3xYi/8hVHowZtCe+dZozlkiG8 yLla7UpcJVoqRZfMKoHwgySP0vNK+1BhgSQSPO6z1ilT2HBMeMBwjJ+6y9/CwOnr hRXiQOWlBTBcLF/P+rpuAsFtv6jdxm/jzXEMgQe5j/aConPchgGzKHy9XiCc2YOz RZDJs5Zc7cmnefTA3f0IH0QaO41g6ST8EnqimWsec/eNaAEakZOZZJRYAhgLXciD 1qjuByWAAn4h9KnKXWg3VtZpX3I40YMPLw319TGAJGnP5kh+DScwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAdhmdRrcVpFpMT38ZFuEl25Pt kTT7HYAcrOSov7Fuohjk7kukQyTQCG4y73sHeu/FZ1IPKzxkOU3kfBEbJunPykkc VuFJPQJmrDpk4j5dvSqikvqU9cP/GliakTrCBiLdb7DO5jsA/8o+3OmN4S8F4Mjw 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Composition Examples This section offers step-by-step examples of message composition.
New message composition A typical MUA composition interface offers the user a place to indicate the message recipients, the subject, and the body. Consider a composition window filled out by the user like so:
Composing New Message Send To: Alice <alice@example.net> Subject: Handling the Jones contract Please review and approve or decline by Thursday, it's critical! Thanks, Bob -- Bob Gonzalez ACME, Inc. | '----' | | +---------------------------------+---------+ | | Subject: | Handling the Jones contract | | | +-------------------------------------------+ | +--------------------------------------------------------+ | Please review and approve or decline by Thursday, it's | | critical! | | | | Thanks, | | Bob | | | | -- | | Bob Gonzalez | | ACME, Inc. | | | +--------------------------------------------------------+ ]]>
When Bob clicks "Send", his MUA generates values for Message-ID, From, and Date header fields, and converts the message body into the appropriate format.
Unprotected message The resulting message would look something like this if it was sent without cryptographic protections:
To: Alice Subject: Handling the Jones contract Message-ID: <20230111T210843Z.1234@lhp.example> Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Please review and approve or decline by Thursday, it's critical! Thanks, Bob -- Bob Gonzalez ACME, Inc. ]]>
Encrypted with hcp_minimal and Legacy Display Now consider the message to be generated if it is to be cryptographically signed and encrypted, using HCP hcp_minimal, and the legacy variable is set. For each header field, Bob's MUA passes its name and value through hcp_minimal. This returns the same value for every header field, except that: hcp_minimal("Subject", "Handling the Jones contract") yields "[...]".
Cryptographic Payload The cryptographic payload that will be signed and then encrypted is very similar to the unprotected message in . Note the addition of: the protected-headers="v1" parameter for the Content-Type the appropriate HP-Obscured header for Subject, the hp-legacy-display="1" parameter for the Content-Type the Legacy Display Element (the simple pseudo-header and its trailing newline) in the main body part.
To: Alice Subject: Handling the Jones contract Message-ID: <20230111T210843Z.1234@lhp.example> Content-Type: text/plain; charset="us-ascii"; hp-legacy-display="1"; protected-headers="v1" MIME-Version: 1.0 HP-Obscured: Subject: [...] Subject: Handling the Jones contract Please review and approve or decline by Thursday, it's critical! Thanks, Bob -- Bob Gonzalez ACME, Inc. ]]>
External header section The cryptographic payload from is then wrapped in the appropriate cryptographic layers. For this example, using S/MIME, it is wrapped in an application/pkcs7-mime; smime-type="signed-data" layer, which is in turn wrapped in a application/pkcs7-mime; smime-type="enveloped-data" layer. Then an external header section is applied to the outer MIME object, which looks like this:
To: Alice Subject: [...] Message-ID: <20230111T210843Z.1234@lhp.example> Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data" MIME-Version: 1.0 ]]>
Note that the Subject header field has been obscured appropriately by hcp_minimal. The output of the CMS enveloping operation is base64-encoded and forms the body of the message.
Composing a Reply Next we consider a typical MUA reply interface, where we see Alice replying to Bob's message from . When Alice clicks "Reply" to Bob's signed-and-encrypted message with header protection, she might see something like this:
Replying to Bob ("Handling the Jones Contract") Send To: Bob <bob@example.net> Subject: Re: Handling the Jones contract On Wed, 11 Jan 2023 16:08:43 -0500, Bob wrote: > Please review and approve or decline by Thursday, > it's critical! > > Thanks, > Bob > > -- > Bob Gonzalez > ACME, Inc. -- Alice Jenkins ACME, Inc. | '----' | | +-----------------------------------+---------+ | | Subject: | Re: Handling the Jones contract | | | +---------------------------------------------+ | +----------------------------------------------------------+ | On Wed, 11 Jan 2023 16:08:43 -0500, Bob wrote: | | | | > Please review and approve or decline by Thursday, | | > it's critical! | | > | | > Thanks, | | > Bob | | > | | > -- | | > Bob Gonzalez | | > ACME, Inc. | | | | -- | | Alice Jenkins | | ACME, Inc. | | | +----------------------------------------------------------+ ]]>
Note that because Alice's MUA is aware of header protection, it knows what the correct Subject header is, even though it was obscured. It also knows to avoid including the Legacy Display Element in the quoted/attributed text that it includes in the draft reply. Once Alice has edited the reply message, it might look something like this:
Replying to Bob ("Handling the Jones Contract") Send To: Bob <bob@example.net> Subject: Re: Handling the Jones contract On Wed, 11 Jan 2023 16:08:43 -0500, Bob wrote: > Please review and approve or decline by Thursday, > it's critical! I'll get right on it, Bob! Regards, Alice -- Alice Jenkins ACME, Inc. | '----' | | +-----------------------------------+---------+ | | Subject: | Re: Handling the Jones contract | | | +---------------------------------------------+ | +----------------------------------------------------------+ | On Wed, 11 Jan 2023 16:08:43 -0500, Bob wrote: | | | | > Please review and approve or decline by Thursday, | | > it's critical! | | | | I'll get right on it, Bob! | | | | Regards, | | Alice | | | | -- | | Alice Jenkins | | ACME, Inc. | | | +----------------------------------------------------------+ ]]>
When Alice clicks "Send", the MUA generates values for Message-ID, From, and Date header fields, populates the In-Reply-To, and References header fields, and also converts the reply body into the appropriate format.
Unprotected message The resulting message would look something like this if it were to be sent without any cryptographic protections:
To: Bob Subject: Re: Handling the Jones contract Message-ID: <20230111T214822Z.5678@lhp.example> In-Reply-To: <20230111T210843Z.1234@lhp.example> References: <20230111T210843Z.1234@lhp.example> Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 On Wed, 11 Jan 2023 16:08:43 -0500, Bob wrote: > Please review and approve or decline by Thursday, > it's critical! I'll get right on it, Bob! Regards, Alice -- Alice Jenkins ACME, Inc. ]]>
Of course, this would leak not only the contents of Alice's message, but also the contents of Bob's initial message, as well as the Subject header field! So Alice's MUA won't do that; it is going to create a signed-and-encrypted message to submit to the network.
Encrypted with hcp_null and Legacy Display This example assumes that Alice's MUA uses hcp_null, not hcp_minimal. That is, by default, it does not obscure or remove any header fields, even when encrypting. However, it follows the guidance in , and will make use of the HP-Obscured field in the cryptographic payload of Bob's original message () to determine what to obscure. When crafting the cryptographic payload, its baseline HCP (hcp_null) leaves each field untouched. But it also knows that In-Reply-To, References, To, and Subject are all derived from headers in Bob's original message. For each of these header fields, it observes whether the origin header field was signed-and-encrypted or merely signed in Bob's original message. In-Reply-To and References derive from Bob's original message's Message-ID field, which was merely signed. The To header field is derived from Bob's original message's From field, which was also merely signed. So these three header fields are passed through untouched. But the Subject header field is derived from Bob's original message's Subject field (by prefixing Re: to it), and that header field is signed-and-encrypted, which the MUA can tell because the HP-Obscured: Subject entry in the cryptographic payload of Bob's message. So Alice's MUA generates a new external Subject header by applying its derivation rules to the HP-Obscured: Subject value from Bob's message, yielding the value Re: [...].
Cryptographic Payload Consesquently, the cryptographic payload for Alice's reply looks like this:
To: Bob Subject: Re: Handling the Jones contract Message-ID: <20230111T214822Z.5678@lhp.example> In-Reply-To: <20230111T210843Z.1234@lhp.example> References: <20230111T210843Z.1234@lhp.example> Content-Type: text/plain; charset="us-ascii"; hp-legacy-display="1"; protected-headers="v1" MIME-Version: 1.0 HP-Obscured: Subject: Re: [...] Subject: Re: Handling the Jones contract On Wed, 11 Jan 2023 16:08:43 -0500, Bob wrote: > Please review and approve or decline by Thursday, > it's critical! I'll get right on it, Bob! Regards, Alice -- Alice Jenkins ACME, Inc. ]]>
Note the following features: the protected-header="v1" parameter to Content-Type the appropriate HP-Obscured header for Subject, the hp-legacy-display="1" parameter for the Content-Type the Legacy Display Element (the simple pseudo-header and its trailing newline) in the main body part.
External header section The cryptographic payload from is then wrapped in the appropriate cryptographic layers. For this example, using S/MIME, it is wrapped in an application/pkcs7-mime; smime-type="signed-data" layer, which is in turn wrapped in a application/pkcs7-mime; smime-type="enveloped-data" layer. Then an external header section is applied to the outer MIME object, which looks like this:
To: Bob Subject: Re: [...] Message-ID: <20230111T214822Z.5678@lhp.example> In-Reply-To: <20230111T210843Z.1234@lhp.example> References: <20230111T210843Z.1234@lhp.example> Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data" MIME-Version: 1.0 ]]>
Note that the Subject header field has been obscured appropriately even though hcp_null would not have touched it by default. The output of the CMS enveloping operation is base64-encoded and forms the body of the message.
Rendering Examples This section offers example cryptographic payloads (the content within the cryptographic envelope) that contain Legacy Display elements.
Example text/plain Cryptographic Payload with Legacy Display Elements Here is a simple one-part Cryptographic Payload (headers and body) of a message that includes Legacy Display elements:
To: Bob Subject: Dinner plans Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; hp-legacy-display="1"; protected-headers="v1" Subject: Dinner plans Let's meet at Rama's Roti Shop at 8pm and go to the park from there. ]]>
A compatible MUA will recognize the hp-legacy-display="1" parameter and render the body of the message as:
A legacy decryption-capable MUA that is unaware of this mechanism will ignore the hp-legacy-display="1" parameter and instead render the body including the Legacy Display elements:
Example text/html Cryptographic Payload with Legacy Display Elements Here is a modern one-part Cryptographic Payload (headers and body) of a message that includes Legacy Display elements:
To: Bob Subject: Dinner plans Message-ID: MIME-Version: 1.0 Content-Type: text/html; charset="us-ascii"; hp-legacy-display="1"; protected-headers="v1" 
Subject: Dinner plans

Let's meet at Rama's Roti Shop at 8pm and go to the park from there.

]]>
A compatible MUA will recognize the hp-legacy-display="1" parameter and mask out the Legacy Display div, rendering the body of the message as a simple paragraph:
A legacy decryption-capable MUA that is unaware of this mechanism will ignore the hp-legacy-display="1" parameter and instead render the body including the Legacy Display elements:
Document Changelog [[ RFC Editor: This section is to be removed before publication ]] draft-ietf-lamps-header-protection-12 MUST produce HP-Obscured and HP-Removed when generating encrypted messages with non-null HCP Wrapped Message: move from forwarded=no to protected-headers=wrapped Wrapped Message: recommend Content-Disposition: inline draft-ietf-lamps-header-protection-11 Remove most of the Bcc text (transferred general discussion to e2e-mail-guidance) Fix bug in algorithm for generating HP-Obscured and HP-Removed More detail about handling Reply messages Considerations around handling risky Legacy Display Elements Narrative descriptions of some worked examples Describe potential leaks to recipients Clarify debugging/troubleshooting UX affordances draft-ietf-lamps-header-protection-10 Clarify that HCP doesn't apply to structural header fields Drop out-of-date "Open Issues" section Brief commentary on UI of messages with intermediate/mixed protections Deprecation prospects for messages without protected headers Describe generating replies to encrypted messages with stronger HCP draft-ietf-lamps-header-protection-09 clarify terminology add privacy and security considerations clarify HCP examples and baselines recommend hcp_minimal as default HCP add HP-Obscured and HP-Removed (avoids reasoning about differences between outside and inside the cryptographic envelope) regenerated test vectors draft-ietf-lamps-header-protection-08 MUST compose injected headers, MAY compose wrapped messages MUST parse both schemes cleanup and restructure document draft-ietf-lamps-header-protection-07 move from legacy display MIME part to legacy display elements within main body part draft-ietf-lamps-header-protection-06 document observed problems with legacy MUAs avoid duplicated outer Message-IDs in hcp_strong test vectors draft-ietf-lamps-header-protection-05 fix multipart/signed wrapped test vectors draft-ietf-lamps-header-protection-04 add test vectors add "problems with Injected Messages" subsection draft-ietf-lamps-header-protection-03 dkg takes over from Bernie as primary author Add Usability section describe two distinct formats "Wrapped Message" and "Injected Headers" Introduce Header Confidentiality Policy model Overhaul message composition guidance Simplify document creation workflow, move public face to gitlab draft-ietf-lamps-header-protection-02 editorial changes / improve language draft-ietf-lamps-header-protection-01 Add DKG as co-author Partial Rewrite of Abstract and Introduction [HB/AM/DKG] Adding definitions for Cryptographic Layer, Cryptographic Payload, and Cryptographic Envelope (reference to ) [DKG] Enhanced MITM Definition to include Machine- / Meddler-in-the-middle [HB] Relaxed definition of Original message, which may not be of type "message/rfc822" [HB] Move "memory hole" option to the Appendix (on request by Chair to only maintain one option in the specification) [HB] Updated Scope of Protection Levels according to WG discussion during IETF-108 [HB] Obfuscation recommendation only for Subject and Message-Id and distinguish between Encrypted and Unencrypted Messages [HB] Removed (commented out) Header Field Flow Figure (it appeared to be confusing as is was) [HB] draft-ietf-lamps-header-protection-00 Initial version (text partially taken over from