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.
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.
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", "MAY", and "OPTIONAL" in this document are to be interpreted as described in .
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 . It is the top section of a Message, and it contains the Header Fields associated with the Message itself. 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 While the generation guidance aims to provide minimal disruption for any legacy client, such a client by definition does not implement this document. Therefore, the document does not attempt to provide guidance for legacy clients. 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.
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 The Injected Headers scheme places all header fields to be protected directly into 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". Composing a message with the Injected Headers scheme is described in . Rendering such a message is described in .
Wrapped Message Scheme The Wrapped Message scheme creates a message/rfc822 (or message/global) MIME object containing the message and all header fields to be protected, and then uses that encapsulated MIME part as the Cryptographic Payload. 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 header field name name and 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. For example, an MUA that only obscures the Subject header field by replacing it with the literal string [...] 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.
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 of MIME part payload with value v Set the protected-headers parameter on the Content-Type of payload to v1 Apply crypto to payload, producing MIME tree output If crypto contains encryption: Create new empty list of header field names and values newh For header field name and value (h,v) in origheaders: Let newval be hcp(h,v) If newval is not null: Add newh[h] to newval Set origheaders to newh For each header field name and value (h,v) in origheaders: Add header field h of 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.

]]>
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 forwarded parameter as described in . 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 of origbody with value v 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; forwarded=no, and whose body is origbody. Else: Let payload be a new MIME part with one header field: Content-Type: message/rfc822; forwarded=no, and whose body is origbody. Apply crypto to payload, yielding MIME tree output If crypto contains encryption: Create new empty list of header field names and values newh For header field name and value (h,v) in origheaders: Let newval be hcp(h,v) If newval is not null: Append (h,newval) to newh Set origheaders to newh For header field name and value (h,v) in origheaders: Add header field h of 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. The 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. [[ TODO: select one of the two policies below the recommended default ]]
Minimalist Header Confidentiality Policy Accordingly, the most conservative recommended Header Confidentiality Policy only protects the Subject:
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.
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 forwarded has a value of no. 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. Rendering this information 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. As in , each rendered header field found in G should be compared against the header field of the same name from E. If the value found in E matches the value found in G, the header field should be marked as signed-only. If no matching header field was found in E, or the value found did not match the value from G, the header field should be marked as signed-and-encrypted.
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 or generating a draft reply.
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 forwarded is set to no, 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. Each rendered header field found in Q should be compared against the header field of the same name from O. If the value found in O matches the value found in Q, the header field should be marked as signed-only. If no matching header field was found in O, or the value found did not match the value from Q, the header field should be marked as signed-and-encrypted.
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 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.
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 Headers 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 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. [[ TODO: formally describe how a replying MUA should generate a message-specific Header Protection policy based on the cryptographic status of the headers of the incoming message ]]
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. FIXME: other examples of unprotected transit header fields?
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.
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 [[ TODO ]]
Users Should Not Have To Choose a Header Confidentiality Policy [[ TODO ]]
Users Should Not Have To Choose a Header Protection Scheme [[ TODO ]]
Security Considerations [[ TODO ]]
Privacy Considerations [[ TODO ]]
IANA Considerations This document requests no action from IANA. [[ RFC Editor: This section may be removed before publication. ]]
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] Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types This second document defines the general structure of the MIME media typing system and defines an initial set of media types. [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. 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. IANA Registration of Content-Type Header Field Parameter 'forwarded' Isode Ltd pEp Foundation This document defines a new Content-Type header field parameter named "forwarded" for "message/rfc822" and "message/global" media types, and its registration with IANA. 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 The proposed pretty Easy privacy (pEp) protocols for email are based upon already existing email and encryption formats (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 a viability 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 to 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
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+encrypted Messages in List View Unprotected Subject, Date, From, To are visible Threading is not visible
Problems when Rendering a signed+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+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 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 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 --76c 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 --76c 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 MC8GCSqGSIb3DQEJBDEiBCBBQlio2vX/u19qayJ1Cm1QL6VZY0fBeGz9o7nEzCRO +zANBgkqhkiG9w0BAQEFAASCAQARvwKQYbbPuADZ7KqyO9LuESdEfBxOF80sHKNz UXrHZo8JdKaKxr/cTAuzBvoTxsmqvzP3ItCBm+javqX22+tHTpqisz5jkoiWyNVS e+F++YX8mXokgQpY26mZ+15Mv8pYYhptn6zdkRU1+QOwwlDCc6ykkCZeXyc+Hf7c xqM6SqPMQ+G7wIF6P2jHCId8Xyl7sdbL0i6PjotesHU+7nQsCjgI/iVR/ubWUdFX CTg8HVy4p683V3Y9DoRNP4MlUdmon8JasHDvA0240JcXxhJn1zEYa4gOnwgu3kh9 3Y+NeucYCT0bXCBq2RLVQSpdNZfScXKL9QvZ3FtB0r6Bmtky --76c-- ]]>
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 MIITXAYJKoZIhvcNAQcDoIITTTCCE0kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAE1K2Qo2Ln5O6L9qgFnOdvuAuXnh2dLiYWIt x7B9W2VMQCtrxTipZfUe+Y4oV/Rxifp4gChJ2lCgt6A4hHyApD1yNqmR1pCT+ky6 jOJlr907Jzy9nIADEjaeKTIHePPWEWPiF3Otlrvg25NobNAE/dzcSgaS+SHsfPgu vW6gA+lfzdoOKIWNVl1AJfbDRw8DeDi5n8ZPLkb/gYteBpY5mC2Iu8TebZ5qstQH i8G01K4xb6E7eMdXKx+gyDxox1P79E4q3dCKwYPK/C6B3AaY52WW55js9mb79OH5 6/XvIEez58lV4a9d0iY7g+aoARyTPE9Z79miRYT0aagyYhblb14wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAWANrcGMnwYd7bg/TA9Wagm3q dbiZLg3NxHQZRLRySCFHt5wGkq1XcD7bWYwF0hSKiI4AJxJapfGUDEpDk1FYBU4r 9zS/elrwCnhwpO9sLfbJPRVvMTgTZuCOaY25ovZWvWtkS9MRDH+WoM5SNTf4vHHu 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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 --428 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="db9" --db9 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 --db9 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

--db9-- --428 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --428-- ]]>
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 MIIPHwYJKoZIhvcNAQcCoIIPEDCCDwwCAQExDTALBglghkgBZQMEAgEwggVIBgkq hkiG9w0BBwGgggU5BIIFNU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjExMCINCg0KLS0xMTANCk1JTUUt VmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2 ZTsgYm91bmRhcnk9IjE5MyINCg0KLS0xOTMNCkNvbnRlbnQtVHlwZTogdGV4dC9w bGFpbjsgY2hhcnNldD0idXMtYXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29u dGVudC1UcmFuc2Zlci1FbmNvZGluZzogN2JpdA0KDQpUaGlzIGlzIHRoZSBzbWlt ZS1vbmUtcGFydC1jb21wbGV4IG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBzaWduZWQt b25seSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEuICBUaGUN CnBheWxvYWQgaXMgYSBtdWx0aXBhcnQvYWx0ZXJuYXRpdmUgbWVzc2FnZSB3aXRo IGFuIGlubGluZSBpbWFnZS9wbmcNCmF0dGFjaG1lbnQuIEl0IHVzZXMgbm8gaGVh ZGVyIHByb3RlY3Rpb24uDQoNCi0tIA0KQWxpY2UNCmFsaWNlQHNtaW1lLmV4YW1w bGUNCi0tMTkzDQpDb250ZW50LVR5cGU6IHRleHQvaHRtbDsgY2hhcnNldD0idXMt YXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29udGVudC1UcmFuc2Zlci1FbmNv 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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 --e18 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="831" --831 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="a1e" --a1e 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 --a1e 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

--a1e-- --831 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --831-- --e18 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 MC8GCSqGSIb3DQEJBDEiBCDXOvk8vYdge4ktwwFa4GFP+Zxia/eTOacb5ZgEXQA7 WjANBgkqhkiG9w0BAQEFAASCAQAIBfufI8gxAWPFjnahNo6lRRGWj0U1S4GkRl6h LCNh5x49ns9BM51cZp+s5KhQSxhFdmuru+wCwgRk7KjzckAnizh70/dEYJmsjSZl zmLEGmtQ+q9MoyydZD9s2l9891WDjsCFjVIIhRkLTI7Zeh6+wQQpGKDbv0MoYQ95 a9HPz6DuuCjCTCv+rUEOAys4X+dQsgDx3hsSITVoKDR11kHVmZnjC4Byce6HY0Gn cEg/VqBGK4R70/46XTk/EgLPsnSPLPfc8Pc1kw6yyF+QNyLV4tKvOKRvNJGf+Pjy GvJIthBGOKFbOtWPpY+nFTMT+aNODuyAVQUmlbQIvz0/WXvU --e18-- ]]>
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 MIIZDAYJKoZIhvcNAQcDoIIY/TCCGPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAJGYWhyOEdeaxA1hlsqTJL/nwL8aIuFtQBnq 8aptWsaRxmbkwfd639Jspx9JZhc4gu50hiKu1HdJ2+IL7vvPRB49SfqiCst+ImD3 syFxHjbMJSpFDNNukyut/SYV+DAHbvgiGxB0vCT8iW+qbKgwvQYcm2Kcs0UYV7ek NXA7wkNjIygcyRSbg7Xdhv9HcGGtIshTBvwS9DaYwmjo/8IlrXfeIusKU7dhZgMK bVVbotXAylbEFH6vpDFWK5pc+DPgVPFe8iA8z02k8HdtXEM44g++0/chZAiqe8uw UARmERg+5Y+2dROAVHRWFvloW6qWw71jBmtf55abK6jJFhSIzmowggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAB9sGmAYY1DHhoMQbd734joYE SjbvkHEPyOAlJI7FfGdAr4I+dmkYeBuvZVM1YWhtejpVAlurNbbLkOEj+yPhGbTG nxBGt08KsSGKCM1blIY9MpkbsdUs0rSkPs33cYeRLJwGTzAsTSy0txkCETlKQBgK 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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 MIIMIwYJKoZIhvcNAQcCoIIMFDCCDBACAQExDTALBglghkgBZQMEAgEwggJMBgkq hkiG9w0BBwGgggI9BIICOU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IG1lc3NhZ2UvcmZjODIyOyBmb3J3YXJkZWQ9Im5vIg0KDQpNSU1FLVZlcnNpb246 IDEuMApDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InV0Zi04IgpD b250ZW50LVRyYW5zZmVyLUVuY29kaW5nOiA3Yml0ClN1YmplY3Q6IHNtaW1lLW9u ZS1wYXJ0LXdyYXBwZWQKTWVzc2FnZS1JRDogPHNtaW1lLW9uZS1wYXJ0LXdyYXBw ZWRAbGhwLmV4YW1wbGU+CkZyb206IEFsaWNlIDxhbGljZUBzbWltZS5leGFtcGxl PgpUbzogQm9iIDxib2JAc21pbWUuZXhhbXBsZT4KRGF0ZTogU2F0LCAyMCBGZWIg MjAyMSAxMDowNDowMiAtMDUwMAoKVGhpcyBpcyB0aGUgc21pbWUtb25lLXBhcnQt d3JhcHBlZCBtZXNzYWdlLgoKVGhpcyBpcyBhIHNpZ25lZC1vbmx5IFMvTUlNRSBt ZXNzYWdlIHZpYSBQS0NTIzcgc2lnbmVkRGF0YS4gIFRoZQpwYXlsb2FkIGlzIGEg dGV4dC9wbGFpbiBtZXNzYWdlLiBJdCB1c2VzIHRoZSBXcmFwcGVkIE1lc3NhZ2Ug aGVhZGVyCnByb3RlY3Rpb24gc2NoZW1lLgoKLS0gCkFsaWNlCmFsaWNlQHNtaW1l LmV4YW1wbGUKoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQw DQYJKoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMg V0cxMTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRo b3JpdHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3Zl bGFjZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gB UCfkacKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXP mrszyidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEF XgOaGdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41ko aZXCN5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX +TWzB2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iP sIVKarUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZI AWUDAgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQM MAoGCCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkV fAEj8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJ KoZIhvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtK tl4FzkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3M RsMtjH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0 LIZRzWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXw fDz8A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyu OfQsqm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3 QQV57XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElF VEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNB IENlcnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIw OTI3MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEX MBUGA1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw ggEKAoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo 7sHUa4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+95 0MFz/evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYW Tut3SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfC n+IQsaqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9 COgEykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIw ADAXBgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21p bWUuZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAw HQYDVR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwH Fwyn8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4K kkOHG25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30Uxf yrZlRAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HV X524bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP 0Qhp7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+ JJtzOKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSz NnEmMYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1Q UyBXRzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1 dGhvcml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkq hkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA0 MDJaMC8GCSqGSIb3DQEJBDEiBCCt+Ik56mZTd2mpSgOXM38dS7jM5alU2FDX9/58 cga1szANBgkqhkiG9w0BAQEFAASCAQCxKLkx5li14OIOcH2tcWqcsQilPLgQ30ck qhJL2X9/Cl22ibOGNwL8w3qSEBeG1a+WtHw3bSqJx1ciRYcLs16ms23no5QoZ0pU fRLmQuTEgObCf+syiTGnWLj8e+2aRVP1L9yEIbin6+hFyp4s393zYhdMOPAP2ruI lg+BxoWXUjXso+8lPgqLawA+9KMI6tQZMnwI9LpGJmZfoSXdHWqWtjdotzZpqsKm Ihr8DBKtUetqgZ2zqDO3zo3W2L6EmNM05BJUmqwAt/cN+X9kws5dAqtHDQhPNTa1 WUX0oTTkMzn1RAlOxfowEStSnfDOOzIqg+L7LgiMw9jhIgP4/uB2 ]]>
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 --20c MIME-Version: 1.0 Content-Type: message/rfc822; forwarded="no" 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 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 --20c 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 MC8GCSqGSIb3DQEJBDEiBCCcDIxr7wd3VCCz1VBG9nySvUJ/Fhzo26f78El/UUbj jTANBgkqhkiG9w0BAQEFAASCAQBUmMGL40IZQmt3Nad/ymEUOLu3Dgfd/nYKuj6P fjKYJFb9UhwtufZK9/WyVtytLsFJMYHZgUSWU3VbHk1L/cO0469Rbqo6CqlLRJPK uN2Eul2UCa+3ovMIQ8g0NBflXrdfR0OVRqvfO91hLFkTxLfCDUG8ziRWOLWucgZg zkVXqEzvFyOtsSbr3GAY817wWgl1+PTFchO4XF+rg7cNysKqGLtjxP9lN3PcURYv TmooTPY46kheab7ZAzKqQI6go7somKmMqD7UsctMLSVZo+EX5/N9vq5znv7bfpoE Rgd+NZNQD+VYDIOU1FI5ZjyjHpRmcFpywjvHNbTBGlYhv3q4 --20c-- ]]>
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 MIIMDgYJKoZIhvcNAQcCoIIL/zCCC/sCAQExDTALBglghkgBZQMEAgEwggI3Bgkq hkiG9w0BBwGgggIoBIICJE1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVRyYW5z ZmVyLUVuY29kaW5nOiA3Yml0DQpTdWJqZWN0OiBzbWltZS1vbmUtcGFydC1pbmpl Y3RlZA0KTWVzc2FnZS1JRDogPHNtaW1lLW9uZS1wYXJ0LWluamVjdGVkQGxocC5l eGFtcGxlPg0KRnJvbTogQWxpY2UgPGFsaWNlQHNtaW1lLmV4YW1wbGU+DQpUbzog Qm9iIDxib2JAc21pbWUuZXhhbXBsZT4NCkRhdGU6IFNhdCwgMjAgRmViIDIwMjEg MTA6MDY6MDIgLTA1MDANCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNl dD0idXRmLTgiOyBwcm90ZWN0ZWQtaGVhZGVycz0idjEiDQoNClRoaXMgaXMgdGhl IHNtaW1lLW9uZS1wYXJ0LWluamVjdGVkIG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBz aWduZWQtb25seSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEu ICBUaGUNCnBheWxvYWQgaXMgYSB0ZXh0L3BsYWluIG1lc3NhZ2UuIEl0IHVzZXMg dGhlIEluamVjdGVkIEhlYWRlcnMgaGVhZGVyDQpwcm90ZWN0aW9uIHNjaGVtZS4N Cg0KLS0gDQpBbGljZQ0KYWxpY2VAc21pbWUuZXhhbXBsZQ0KoIIHpjCCA88wggK3 oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJKoZIhvcNAQENBQAwVTENMAsG A1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNhbXBsZSBM QU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwIBcNMTkxMTIwMDY1NDE4 WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExB TVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIwDQYJKoZIhvcNAQEB BQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfkacKTg8cc2OtJ9ZSed6U3jUoi ZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrszyidmbuZmOpB5voVQfiLYYy3i Ox7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOaGdmnx4OG/e3p1fIKM0dPzZLo OAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXCN5XL7wWTLMLeNf9Byb5ksKqU uqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWzB2zNS2OF+XIVnzRG5DeoULq8 v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVKarUCAwEAAaOBrzCBrDAMBgNV HRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUDAgEwATAeBgNVHREEFzAVgRNh bGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoGCCsGAQUFBwMEMA4GA1UdDwEB /wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj8OeOr83zdw8wHwYDVR0jBBgw FoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZIhvcNAQENBQADggEBAIFJeKCc sTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4FzkgRyOg31/+Cw7H8e30iLrPI FlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMtjH2x9SG91PEM046gfPnc9gMG HjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZRzWmkw1RF7FOD7PfB5v94M527 4XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8A0enITGXnoEkAFvvjiCqh64P 1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQsqm6hvrDTqNpHNZ015fOURza1 SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV57XV/QqmiXDr0+GrOmqnXMA0G CSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdH MTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9y aXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3MDY1NDE4WjA7MQ0wCwYDVQQK EwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUGA1UEAxMOQWxpY2UgTG92ZWxh Y2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC09InoWDgWPk2af0+S tijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHUa4xQUl5JO6VqY18LANwORjrc 9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz/evPgP96wV+z4TtAwW2Z34rT iz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3SryCqeHEFbZFkB4urMk4xrIJ C3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQsaqpo1d3f9jSkbtAV5w3vzfo g8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgEykRiVokFQgqQ7XNDU+r3SeOW wks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAXBgNVHSAEEDAOMAwGCmCGSAFl AwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUuZXhhbXBsZTATBgNVHSUEDDAK BggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYDVR0OBBYEFLv2zLItHQYSHJeu KWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn8QkoZTYaZxxodvRZMA0GCSqG SIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOHG25nY/0eNARD6/oF0/sYonX2 doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZlRAzEf7GHqgB/NyjOad3pdpVY eDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524bKZa1oPTUNlm6QpivtqDIdqG JdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp7poIccGE6I9Tsg+RrOA9iCQs Pn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtzOKypyQ3eoZ6EPazXqMyHAVcs m0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEmMYICADCCAfwCAQEwbDBVMQ0w CwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxl IExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eQITN0EFee11f0Kpolw6 9Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcB MBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA2MDJaMC8GCSqGSIb3DQEJBDEiBCA7 4grfze+Y7DQEGFAYHyyvRpNkuuZFR0V+RvSTvu4FGDANBgkqhkiG9w0BAQEFAASC AQB1KYVvQNZpe3EKeM0XhJrlJNxneVmZWFCEl5YFeRsO8FeIwJkV65YtFJKjOVVy qYuZBGz4MsKaddXxAOXI/Q7cJ+70d9iOc1mL3PD2/U6DOwwhNfJoNSK7miYfMASV 42TMJWTt0T1ORJnvBitjkTuZDus1tp3xwxbrZTa4pyGaXEhBW/Fc4z6L+z8hpQv/ +6dw3+ORgfc67VTHVnsVVfb0UPrWvdxFdL5xYdqXxlhDsLMEms2ttHHzvjC003Kq As0xMHEmMpfdL5M69MAjvroOUv0SXETfQaxca7IKd+9xUNNRretZ9xz2kn2uD+k7 unTEyVGeHrWmQMw/8MdvEac/ ]]>
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 --12b 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 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 --12b 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 MC8GCSqGSIb3DQEJBDEiBCCXRoUdgR7J+TnI6kw8MpGtWVJPCnoAB+XfkDf78dWi cTANBgkqhkiG9w0BAQEFAASCAQCitU3JsEMd9FhqUu87UxYScDI1pDfZnX1vjges xBmmSy5lq5vvs+axKK/hTOR7YLSuLJLNwxJgDCPEmHi1hV5Tpj5mLH8qEXu4c+kK s9is53v0NvibhIvDEpnqNvL/kMVDAk2gTqYHCE2Ij7qcWWNhnGdweMJZsBvLy/Xi BLaD2t4qHY9lPaeMugDrxThNWEhjoDIoI5f7NpBPYvJgB7b1cJhXqil5weYrJiGr hyTr56lff+Xjs8qjgrrzdJ8HHeUsxDJulrX8auo+pIKudcu41U8Ben2M9nCiVbEG aqbbPK7xip5c/YZEaZWYAs8w+dif68J8Eo7QO/kkr45Tt5pf --12b-- ]]>
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 MIIQOgYJKoZIhvcNAQcCoIIQKzCCECcCAQExDTALBglghkgBZQMEAgEwggZjBgkq hkiG9w0BBwGgggZUBIIGUE1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 IG1lc3NhZ2UvcmZjODIyOyBmb3J3YXJkZWQ9Im5vIg0KDQpNSU1FLVZlcnNpb246 IDEuMApDb250ZW50LVR5cGU6IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9Ijhm ZiIKU3ViamVjdDogc21pbWUtb25lLXBhcnQtY29tcGxleC13cmFwcGVkCk1lc3Nh Z2UtSUQ6IDxzbWltZS1vbmUtcGFydC1jb21wbGV4LXdyYXBwZWRAbGhwLmV4YW1w bGU+CkZyb206IEFsaWNlIDxhbGljZUBzbWltZS5leGFtcGxlPgpUbzogQm9iIDxi b2JAc21pbWUuZXhhbXBsZT4KRGF0ZTogU2F0LCAyMCBGZWIgMjAyMSAxMjowNDow MiAtMDUwMAoKLS04ZmYKTUlNRS1WZXJzaW9uOiAxLjAKQ29udGVudC1UeXBlOiBt dWx0aXBhcnQvYWx0ZXJuYXRpdmU7IGJvdW5kYXJ5PSIxYWUiCgotLTFhZQpDb250 ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InVzLWFzY2lpIgpNSU1FLVZl cnNpb246IDEuMApDb250ZW50LVRyYW5zZmVyLUVuY29kaW5nOiA3Yml0CgpUaGlz IGlzIHRoZSBzbWltZS1vbmUtcGFydC1jb21wbGV4LXdyYXBwZWQgbWVzc2FnZS4K ClRoaXMgaXMgYSBzaWduZWQtb25seSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3 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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 --ce9 MIME-Version: 1.0 Content-Type: message/rfc822; forwarded="no" MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="c33" Subject: smime-multipart-complex-wrapped Message-ID: From: Alice To: Bob Date: Sat, 20 Feb 2021 12:05:02 -0500 --c33 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="bb6" --bb6 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 --bb6 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

--bb6-- --c33 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --c33-- --ce9 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 MC8GCSqGSIb3DQEJBDEiBCAv+o7fTfRFOqnpRsH2sYzOleh5w2W+5q6Nde9GJQWH nTANBgkqhkiG9w0BAQEFAASCAQBrqtTw1eU834PA6rF6Vsac5dGAswyv4vh/EVxO xBY7A+uEacaMOXRaSzkTqehOkOGa31d2bV6XmWbcR9kNvradw//dXOkctHW/cW6x 1BALj1aFAbYmObCY/FTItu7nLGIAIQCm0W4OVHgH7I/QXOsz3o7hH68SWItJnLDy cSEDzRKNh1vl5cN0euY0mNA6HcvKchkIlWCj1pcJVmTq3FQE4GNeeO1x2Pz3ao7y vDO/E/s1iF2SiPS7GcgluywZ1ln5xAwR95/G/lUlqWFBXPAPgIMda1kDsqRI++tE 7aFVuQ9rEoAQJ8KeS8QWA/Lf/iefFfu0ESJxjRDdbJ3+gm5P --ce9-- ]]>
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 MIIQRwYJKoZIhvcNAQcCoIIQODCCEDQCAQExDTALBglghkgBZQMEAgEwggZwBgkq hkiG9w0BBwGgggZhBIIGXU1JTUUtVmVyc2lvbjogMS4wDQpTdWJqZWN0OiBzbWlt ZS1vbmUtcGFydC1jb21wbGV4LWluamVjdGVkDQpNZXNzYWdlLUlEOiA8c21pbWUt b25lLXBhcnQtY29tcGxleC1pbmplY3RlZEBsaHAuZXhhbXBsZT4NCkZyb206IEFs aWNlIDxhbGljZUBzbWltZS5leGFtcGxlPg0KVG86IEJvYiA8Ym9iQHNtaW1lLmV4 YW1wbGU+DQpEYXRlOiBTYXQsIDIwIEZlYiAyMDIxIDEyOjA2OjAyIC0wNTAwDQpD b250ZW50LVR5cGU6IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjVkYSI7IHBy b3RlY3RlZC1oZWFkZXJzPSJ2MSINCg0KLS01ZGENCk1JTUUtVmVyc2lvbjogMS4w DQpDb250ZW50LVR5cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2ZTsgYm91bmRhcnk9 IjllYyINCg0KLS05ZWMNCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNl dD0idXMtYXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29udGVudC1UcmFuc2Zl ci1FbmNvZGluZzogN2JpdA0KDQpUaGlzIGlzIHRoZSBzbWltZS1vbmUtcGFydC1j b21wbGV4LWluamVjdGVkIG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBzaWduZWQtb25s eSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEuICBUaGUNCnBh 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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 --34f MIME-Version: 1.0 Subject: smime-multipart-complex-injected Message-ID: From: Alice To: Bob Date: Sat, 20 Feb 2021 12:07:02 -0500 Content-Type: multipart/mixed; boundary="193"; protected-headers="v1" --193 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="db5" --db5 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 --db5 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

--db5-- --193 Content-Type: image/png Content-Transfer-Encoding: base64 Content-Disposition: inline iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== --193-- --34f 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 MC8GCSqGSIb3DQEJBDEiBCBpheScfJ+ESh8/z2r5jHx3Lw+5VkH8zTicO3HRGxfm ozANBgkqhkiG9w0BAQEFAASCAQADy9VgxUcoI8DWKdyHqPM8nLuaHB1B/SONgbzi 4S1gIMs4wR6S02LpiG36z4/zFw0JUbvqwC2WJN7+W0Vra6ZX/x7Hfmv+uqdsMW6j r8IXATRFWNm6GEbih2BsYABTNy8z0JGs+y6dcNNdDIwDJIkJETi+xv1eFA0deoWI PyHmUjpzzjOcTAkFnSsa4lwSBOty8lZPW6u0klUx+VVGRkgg/0uXTBB1yGD02gbw q5893RxO3g5zzxaYJP03zyO/WW7FmCJNNQbyZbQD8R4rvR0hVna0r7XoW4Q+WZfU Dz29oLszzmumpedAaP7q/M0jySdSjWfQn1W5hHHhAMIlwcqt --34f-- ]]>
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 MIIVLAYJKoZIhvcNAQcDoIIVHTCCFRkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFHb+aM8bhyJ1nFFuBDyyBVQf2IplykrvvYb mKqBk08i2gecPSOMTkW5e2oQ4+WT4rtU4E0JXfMSA2KukKc+QUA3ycVCoL5zhetX GsEx74S5P4JMY/uAoyBlEogGNi2lvagvgOGkqHJCZAjKjPNmqyTfafyv1Y4BQRQ+ WJi7mURDIbgrc0xfcC/yt7UWxFlfUhm6n7rTvRKhe4D0EOOB8yKupUgcDzBMTw5F P9HEy0vFij12+LNKSsOPhVp0PbPkMCVi+ERtXEgV7C7BRVVYBiprpYJxJryO9t3E jmIupqHZMgXxlAKFpBsdlPWfI1mrMVZTBpRgy8Bds7CORgWbs0MwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAX1PxPDDlV2Wo766+MhR82lW8 pD0GWAM1ScYPggh4t5OFmSjFtyiqawhMcQhoRsAkGV387oXupYXH/lkaD7nIdZW+ pZK1/RZUU0txvlsRIpJduXcWm/Dsu0lQtQSfcg5FaslSMjBpMI41BD2KC9M5meDP 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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 MIIVDAYJKoZIhvcNAQcDoIIU/TCCFPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAEqWQtP9NMp0lborDI5F55uEoZxerbw2f8G8 04jr822TF4ehQnzqtlSmtb3q7XZZGz3OVYv0JOO2DWrWWbSzaaWHXwJ8HdM0vxiO 87SvZMWXXzwrZSyrabmCte7HhJOo0FYqMphkC8UoGtIE+J5Z1XpZqjpiicTDHZPD qKPIXCE026LS1ujO/1l/ON5cBrdMRlzEE/tnl2vA3e95pUEM2ILObukZPPKLiTfr ejLM2/oQUklYmh54leeC3dQA0xIf0Wktzrp4qt/qJPPKI/RCw/JL0Saf2x005pET PBRhxQdPEyjKfBRIOm/FMa+LkAqzjHlJI6MbYs7a+zAZvqH/tXkwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEABaLUv4/qgPpg9LQVoTctoa3J 8+wK32xlFwCr3LzD4A+3AZGAzqgJ6roO/cyDbz6swNjZQb6IvsHrxn2hCLyGS7JZ pxaqvNh0MTZ7ppvAAMY/cbtim6oo+aR+YBFMuUejNy2Lf4g9Qugs7C86BqwT/DDR 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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 MIIVzAYJKoZIhvcNAQcDoIIVvTCCFbkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAC+Eq3peshJhf1JB/ataWrNRTuNhGtgwfe7q 0EmuJ93I3x04yobd1gfM+UQ8fBXZNobbjj57dkoxkbYEEtGKltv9PQrZ4Qw/e8UM rgYA++xUC/h4dLTBBD+6U2KFinZFbVBJ7irGCZVB4ddzF2F9dMzZjMH9DOZIS4Yy sB8Egd8ouTVQCLCfc7FB7i6f5qpfj3FibrPFQBrxFobqID08eoeQLv0oNkI4b78W xdkG88IHfdWmjCr0+5Zj/1XdmMnuQfDaGV0r4FemW/gCjq9UnQCF9Z6Yi3WQeCm9 xyEcMfUBWbBlpt5sBXqfV9JrdP6/5bQn53myy2B77XRrGmIzA04wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAdfxEVSY21BQVbKsyGRIhEI8f oJYQGAob33mMh9x08UAKGVuquskYMwZs2ZzPcFIPCBQquiecjjXN5wxq1MWLaiRW Uxg4tqnwezPRnGQD9GsjwmlV/n2JMhbMx/iXXYfvZ3f3mEwsUzfKPkxmO/G3j6q9 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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 MIIVLAYJKoZIhvcNAQcDoIIVHTCCFRkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHMG7sjRDCJDMqgvQrFh4sk9MkaJJY7q6B3r hY87n3jM6UYk/ZaBi9uzcB1pDAF0hJkFLmo+PRUbFLUrmeYfQI6OuvVElpwIDWMp cMtfzlXgKAO6fh/On6aoVhpfv9EmaG1rCU5ezDPPbaXW8caNi2/yvL0ustpqKOTj cOLgMK45tPcHeIaSD+8A4P0uf/GLzEFhDPdJrt3mVq76UbAoIGasA/sDhhg0xygq ZH3IPQoYShFEUmsK+RC9Sc9dmXtVYPByCEsPdhTieJyjW695dde8xl7ZeWS+JZai QK8pXZUdRL8El82+001HTXZYybfF05sFmJHQZ3LlftF2Dqs800cwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEALvjSc3y8/+aA+Mk2+8tupO51 fsr8cR8BV0+aR/CYDXaeAFg6CPk12PnLcpFRZDdqitxfe7SpMgk0oT3IsBxvuOsr 0QckRlRLOwlv43Y9jJFMc7VInrB7bJ/cPHHgB07tPtB69/Qf252gsUs3UbWko8JU 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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 MIIVDAYJKoZIhvcNAQcDoIIU/TCCFPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFeMxt6IIoOR5Kq2Jiucu85qezrNEQcYm6sV Cuo2f+/3QCmr85ho7PNGXSmj0LkmkvIAh4RYf2fH6jqYSYgsxQjT3jOcx70hhTms zQV8e/UJvWRvxQHhPbtnDFketPi2CA++Y8zqvbl3L/dBeL+ltiQqcQprqy9RY5pH FibcQ5OkxPIzBZQUL5NrjwRf16gujq+nGVrhphjwjWsCX+ypt6ZrrBPtje3Iudw6 /0MkMj2lJPEkgWvFEFNL/FkcNRzHlH3dQxqjaf28Jp7eY/3tF4NVHcirE9DSc6hV 7v5zVlVEtthdFE9shnbPxf+Sbww+M3ZTVOxJwGNwPwhM7ehf8wMwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAZ8MBsyH2Tp59sokhPP1DnTLh iblpxffhKGR1N86t0QjQcmsND8MhB4aM7BtgsymR3IcdKrchClmkt6ATp9anhFwz 7U93WrdRIUcSqLnwoCU5P6lGpM+w6XYJqWjpU2Yd76iYLPOYBeAFtMbxdrOEwSCh 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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 MIIVvAYJKoZIhvcNAQcDoIIVrTCCFakCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAEwle5fdKMS6hyob72qHYwMpicWoxWhovcMx m9ncW3nWi8JUNK4Y306rc91m1a91Bnmm6koyF5vbpMTU7MQgVK8Xsfmc8Pl5UeX7 9nO2hq9Nk5YDrbEy2VetDe+8FmyhJHM2AEKCRYJENj8JVN32v38+96h/H+JtAagN hbEnXCjwumjHMPq3nqq+32oFDLLRppc1JZ1khgX2LCH7MjfRp8ikVnSvAUa8tdtr uWtEPqmUktYXUtad5ZqXQXual6KDi+0XCy44Ou+txnGyzY/iFBl/U9o11QtMSBaq hrCIF4WUgYlH1u3KN97+lm0qxlFcLQHGZx/eEhbejFEFwoFIOukwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAKiTmrMj8VnpLrV7+Exp1xnLj Vd5b5eQeYliijqjmlUqj8JoYMSe5FokiSfC+lheSGabYyRZ7KxKY2NRScXNIX2Fz r2Gv9imDrelGioRcACAbwJTj9aJYZqcY6NCkfvPvdhcs0sVvw1L3CX/iUbLkw5xm 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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 In-Reply-To: References: MIIV7AYJKoZIhvcNAQcDoIIV3TCCFdkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAJG/Nu5fmnMkn1fBsCANbQMYLALsx0mJWEly TzK5u5MUntTeOq+fVAUULIJkXaF4inxIe6HSau/bWDWISRy5txztdBIrGLB2RZt7 Yq6OY4UVqXmD3EwkUab9wJVVj1ZTP4O8ijOAfpCjJkzfcQD5J0ZLr3CRXz7JT1wR CUHwhSBCMOuy7/lM2fKeyI+ThUNFUQQRECIjA0PmMrQt1dYM+bXNPi4lY9BVM5qx J8DQG9XNcQtPsIfz7ELwD20a7jGykPYUHzyFE681x+4KTBKjRZb9t2Ezecydep9M T92aV0ZU4A3Vd8bujGl9sUvWCbFR6/vhT9TOHHpqRUOOLJr20iswggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAKUK3Tne27yc9+vIqGMeTO6/u Ieg0Iav3LcaUwnCOGLjLZhlnpZEzC/SfNTobX7d/2yPH5oc4gDxGekJO2YyCkin5 RqpYlhIeCEWtii45otBUInis/kAroFNbe7TOfJ9ck5tVXxLJ0WwG4mW+CoMlRF6o 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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 In-Reply-To: References: MIIV3AYJKoZIhvcNAQcDoIIVzTCCFckCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBABgRQRzXTRs0Jqxrl9ouqlyyOUVTZpzsEN4E rRGV0bKlOV1O8OiF4s73Oamfc1GowC6YOss5JBen3EQq5NmMsFXjlU5sSiFGgsX6 IjkVSHC9c9QtdJtXyEoqEhf2lGJ22FcLjU0M21XxtKMlArch5aouJO1+nTj8AIqk 25JNvqG2dpiLaN61T9hSnyZe7bqDUflBo5Xm5REOc6EBvO+lFgjtIJB73QWiGBu9 C9iPJPz7du0yIReoX0wtkClqUzrBEiqO64SNQ2MuLTLrl2niNDfaQrvfDa62Y6Zz RKPE+I461BxC2Evp18cJVdmOLPE/41b6QPu38l6L8/fSoKYoCk8wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAbgflLBuq/SuTA535o03fl0T7 hFJz1cRgrOgdYfajI+bAIAncrUXPCxEhAIJAV9DNOJnISnnTNW0E5ND32Dbcji83 GwhT2iC+Uzx+0auUYuuVZ/go7eHMUWrY1Vm5dqNq5JbTwVgWy8lIC5CatZVYDVFW 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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 In-Reply-To: References: MIIWnAYJKoZIhvcNAQcDoIIWjTCCFokCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAGNl0aq5o2OJUxeEgaKipbTTomG9IBdUTU2t ZdTEG6d1H4121Dz0Q5zSqpMHqbqb/HQpqERcNiXtq0vu2aBMF48OoZoO85R4khlC 8uARKo/8CAcUANfGIjie+ojPw1o8eaDT8CQL8/T2TZ012rfdQahxsIAr83/tFQMD 5EqnQVxHA9IM69Epdiwk4IrQjep6djisHGG61WLrc8tbIXgBM7QHKdrEA9yJuWFp zpnGgYTGHi3gPzE8H4MJK3hnZ3uNAWqHy/nLUw/BwzD6EOKM5CRoSKcwYI0yAYu2 zGrO7E5fvoqfFzBsYJp038zjw95tEOGUDeszdrGP2dPg16g5AjwwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAG67SjjL4JZnZLqZM62xH8Cdz SGchx+DpraOfE5ehEpY40Jy9j8sF6Wu21MLUNRZHQ+pUlNky7tA0DCIWcIbJlWV1 PHfr/M0xf++3kfnJBFAjiGzp1ROhtpeP5p+qtky9VLxoArhI071rvEG0Z3u+6IO5 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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 MIIV7AYJKoZIhvcNAQcDoIIV3TCCFdkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAIEzSE7YJfWjy0TMQGEfYcrcBw2uruGZw+/k QaHXEcEFdwDSaKvAzEFoNN0xMpZ090ybC5MHqteYMRpaax43TsCnes6XevL7o7FV gSMI6CCnmVlY2Dvj+oGPHkl/ZkFRPz+Hsrnvl65Fs19thjbtQ7LX9uKE8TBODLRF nCnuyDdHx7iDJGI6xepIvD4M3zaUwpNa3fFi8XOC7UH7br6+UGCRQCZl9nrAU1W/ VvfRt+6XSWXl71IU/0syMw4ghwS2tsLgZhIrDkFNlEokgVR8bDejaV9px7jH+d3m FJ0t4hBjsZAfnggaecXwoKUaPqlj6Xl0e9cLtqwr+26h1TmA8X0wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEACUHcgXEC4pKuedLh3CB0QLAW HULF5htBXebTlJVES1voU9Smp5OkueBMptF18R2ojjM36C5d3xtdsBddVweJqNyA Hgp92O7qVoPyVXvp7BByoNRgZcrMx1pRoTREEjCX585MOXEBFUxRVRPohViZaOAM 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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 MIIVzAYJKoZIhvcNAQcDoIIVvTCCFbkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAD2qfM1qd/wlIn5/weLGjTIvhLXq8DBtZlBx 74LEO41mLd1hgnRYsPIWC2PtjkC/seobOuZC+CV58bybhtZc98t+SPFhw/rCzvKD r+TYWJWJ5klGojWrmZJXuXFUA6GW1KvNQYQV2xkntNjeOe0dUY/UwXDXnV2hwOSz K0MpYY9/M847oDrGiWv4xDqLd7WrN+ztQiy+4b29oA4Hy40Ll/z9o3yNMYEeZ+ZU oICNWAvSHhIHuHztoEhhGI01wF7KFpygyjP34o5oC0MRFwyUPmqJEuj+/o265hfj zKAzd20Dh0lY5f4cKRak/Nq7j0YAVUMftIn6Z1AI3NBdqAuncSAwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAmcFRU9fU/PySxv4kLIQ1zBV4 nTTHsBv+t6RGYcEOmqToQCdNyyQie+HqTJh6M2/Cc1sbRuOVsrfhJc0RQqKG2VOa huevYf4E/x7+3Apl7zzg6rOUfi0rSCv8y5PYLaHe3AbZvJr/ilj5YKIj8+D6JnZe 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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 MIIWnAYJKoZIhvcNAQcDoIIWjTCCFokCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBACGdltueYBykYh99Md439ZT6COO0DuOkUssi mv3sONO23lQTEH4IDhS8pYhggW0VuZxgSL6feXXdBPYdr8UHnTNZm2X8X2fSpZ+N HcdEN21H71tpKrFHxIznR1bEU7/Zb0maRg8+O7g5f1cZb/e0dnjEOLQsEplkUKik wZQmfi0FJaFRTGEdQh29pQ7Ww5rVltn8jyZvr6IFqVPjOlhYJ3SciUdJxygMnF1N FyIBlmNShELvkr8C4huv3q2LOr02QN/W8TdflPIDakY5zijst5q6ILX6L2EypcuC LBTFWAyWYCsechbb0ZyZVFzg7+Yj/ELIeOg7ZC0iPjQhaB9lluYwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAAas3uwX/STpLX/lRqYFr8HSB yVCdYgegxlTMbw98g/QmQgcNvrzFDvp6vF+VkGPOqTJAlFSQGJWraNLTmbBQ94i6 NXuQ3fDrGzr0Ll5RbvpB0VcqrejOrOojHrgkHKGl3DRTIH6tC4mgmOMYZToCev+H 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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 MIIbTAYJKoZIhvcNAQcDoIIbPTCCGzkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBABfhanpcfRrENuk7s3Y/t208MLeCOtKAgVuq +YxkFGf1eaxIShygOHSwbXnGM+P3BCMmQ+iTm3smLm5KvZdO1e9Mle4QERyC2//p VNSbK6NWD+5sFc9YMZ9BrQDIkQ3gSDtVpZiCoNUh/IFYw0d0Bu55kTxrD1iIbPdx rPSwuyLw43V+ytTi+PpnlxvI7mGYNLZxHkFIaY1zqjpqdMphNko5TZBE2tXZP37+ MQ6slzZZ4nnUDIPO9u85PlEabQM4zbTd3gpdri8wZnNb16kqnoMR5/uv8JmAgvEw hYY1akgApGMqM9G7wjVSd3vk2kXPR8iPUP7dszHXdlbog0G7hlEwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAEn22GWE7bdTRn4fqNM0tQeXb NqN2BYvLUaMBiM4mpghZq9GH3NcmFADp6SMPjrh871dh7aKLQhOsBKLZ5eMlTUJr 3CcxczSGd+8urr8fnH2/aHmarkkz8YE8eUNIPlcCJbkAuw8cskDdHgE/xPYpcNsC 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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 MIIbbAYJKoZIhvcNAQcDoIIbXTCCG1kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAJMTpwbSzvTtudiTaWcx0TvyxUZpiHL+UmRp WR9LJ8Evl8vh5FnKDB9TadYiAhseHiWnelYjygz/q5C8lV1HH+WwEihs6x7gIROb IAudvBR12CMjm4HX7GKkCNDyFse+QRiRuuuQzLG3d0/2slCA33mCsOhkE7RRtjvz yoxcOJ8Ulz18BzFtjYnIcjqR/zkeMtaTdaw9S15wLSoCHhdnAl0eYAnebMhpZM5t NatVeDmlzoJAlqQKtaE/K+LWfhSm2Y2GKD2I7XaslJS0QBNdDd00AF+537e4m/MY RylhEzNmR0dz/Tyg6tyqakhXnPiQDQRv+RaXMH3RWDJWfZI1rYQwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAger+uW41F5G04kqx+ZTa0DlY 7GfQxltAwowLQzQPB1zUs0/WkjzvXFDBcFkXL/8RPGyqT+5GvNxiloFEB/emqqTg qee5jWKPur+BknpyLKQN5bxprkeRSccljN2hO+msRhI6m6T7HIPs7Gqdwtw0C1rY 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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 MIIdHAYJKoZIhvcNAQcDoIIdDTCCHQkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAEgnvqzNR+Do6JAxBP8F7JUcbB8kS7mxU+3b foHqCQ/5kO96KgY8libT3/JmQw+yAifncpIcl+22N0NqaqisYJj9dKA3Gjs/Uprb bSN0zOavKBotza78JC1mzmIIKQ4Vy9QuStaxihfghKti9dZ5+elgenqQhZrq3wjX MYBlnGKNgrXmNb/8HVb+ak+kxK9ZiRj7s2A3HBQz4kFOr2wcga3QHrnUFqlllFw+ Qod2RDSowp7uvZ/vdtVdVcywnCh7P45RUFO1PL4WVr7AhzRDXsVmYWF1x+6uBz9M NxOXJX3f7y5+eoTzMUWhJdUwcRM2z8EIT7EdG6I2n1XCgzT8jsIwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAlNiYwrBY5HIxX9zMW8ERT4tV Hl5QupEY6aXcOJhoRBLO3hrV9mEbo9vy3DlQkwW1OIsI4UqkQQ98dNeDQYEzy7TF onupxyn8dy6gInGpUpqS6Vjnemvm+XbYthI6xuRu4wO1PEnGPuCsFjE79EARuh/e 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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 MIIbTAYJKoZIhvcNAQcDoIIbPTCCGzkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAE0WeE2CZplu4oxW9silJTfwzOsPhm847d7z qIXcjfvT8bDw1Ftlv/4KmZLDPdBnuisuVpyLo4nnCIwQJYpQgGBTT6QS+49zKBE6 MCBAtAEpO1EX96vni0EnBTirqrlYTpyCfovzY7Wit0AGZtagvTDbUFZ0x1zspCwd jrQHxNGnPvIUgWOmZvE8xcUU7goh5lIMlCrTSo7O1VwvBcAl36MvP2cq5fMwshaq 5sG8Tisa8scczHgFPox8g4dRg3avviuPIeIWlhFHsjHOyxK//eXvbIAPvqSX2kkN XA2WosMZFaOFDbreUYfH3vXXKhM/bN/ppP0j79SP/Oo0zcZNrFswggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAHCEttYG1eFD18WMLL2cj4QA2 9ufo9YrcguLxREsAqFgSdjNWumX+O6TbxzRXIRWUDM7Fgya5itiSeRX9vVMPqmoE IqvVaBvUJrC/vpqimtsZ1DzfMILZS++8zKvhe65KULce+nV5uQFdCqY0haaC+r6Q 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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 MIIbXAYJKoZIhvcNAQcDoIIbTTCCG0kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHU8bGe/H5LsJ+SjrpHwt7+3o55WiMyCIM8u JDc68NB26HoxcT1KAtf33RWDG0EF3HshliusIPEIu99f46HunvPjw3oIBJlXcMmQ 8CHOFlx+iX82VOPuiW0O8lW6+aVsK3zZF8gxiFoUh/Z+kgL06L58OPM8v+V2cwIa ApYX+6UXWvVY4CBZgpFtv8/L5tvwIFX0Zv/Yl50d4U/jFzc7GVq8Baz9JC4UjPrw 5QYctjl3CCCLNdssAzgxb0Gb/2qXUkPKNel4HxCBE9tWVtAT6N0pJ42iGEeC87yy RRk8MhzpaVghBs84p17CCHt/5e2x0Db7RS4fFxzr/KHjy0daW04wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAjQAOlUQpwd5dQ6rwccqfmudD 4Vr95tB9KqwFa6dQkQ+ZGQPO/rJMcL7aH3xKJZai1UmzD+B7Qkl2TVg/dCCkyxHC 9OIIRVw4Hd5H90/K1zxuX5D8bTFsZrbgQMhHTo6GnxZFbkHrW5Cj/XDYmpFSdORg 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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 MIIdDAYJKoZIhvcNAQcDoIIc/TCCHPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAByIMaFU0xsD/lTxj7lo116DStu37Nert2mk 49trfnEu2mQhv6MAkHx1/MoOvM9j5S/Q1YSfRhF5c7XVgUWLl7xafpFcdxqwyK5J BfPzYzqEjA+P/oGei2qVW/IvI5iJkbFD04TPw4Cvfab6wNOnAhLiflDJElxx1uUD 93ha4H0ng3pb7MBP4wyYCSeCc16mqDolTGCP6ejUEzn9GAAMAyOVK6A5DxVe711M UtAdjXwP3Gy4IRYTFfISTD3nKp51OaKSv8g9qQtGCuYdfJxW3eB0BpG6OmBLMiEU /jv1oVMZp0NwmuT+BSbkdecwgwuwJgqOOFn/4aIDEmyHyC72fakwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAELJsGfVgEhqvwyS2R6g8/Srk JTe+rInzh0ZtMqt+7FoT1/5aaw3JDLnPsncJyVpqrxrWq4lJadCL5ycSUOaspAEP RLkQGexmMk27IYrhwXfTkALRWqrH3yvGihyuSwALfMWqX4uWgyJB4TGxN/xXfvWl 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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 In-Reply-To: References: MIIcLAYJKoZIhvcNAQcDoIIcHTCCHBkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAIJ1TSnodbIX+xsUfgRTABHJ9Cp7TJAEjB4Q 8bJ2SJQsuXjbky2uXOISzL5ryCsv37l6n7W+MLKlTPvXIpRN5kkk9mlAlZkCprRC usJvS25o/h3x6yb+XnhWORi3hB+b87zo1ysoA7YcyF3Qq9YCe8bkrNrstnxe6uzW T+1EhIhPRzZRpaJzXKer4JjxKKJYn3o+pLdsD9/T1sAJu8ueGodVcn3cnDH5oW8j 9BnAVIS7Bosh05moOD1jwg1taKZu02ycsVzIq7U1yQ/kXQbxMkdc3sCIJHSH7upn 3/filDlwvHZynaQc5oIrGaXfja7+BlmCJJ3pvCwRg1BTs+2OkhgwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAJJ0GA1RKCaIpRJ/hSThEF8Kh MV66qx8SQ4zF77Q0N1rgxGmQagbwuJaWy50TKpbEet11elIl4pERnA7ySapuOE+e myif7rCxUr08+MyqSidsGm4wSUC9MwRfUC+t9CwwV55MG8ajowtd5WhCKPbStsup 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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 In-Reply-To: References: MIIcTAYJKoZIhvcNAQcDoIIcPTCCHDkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAABVM3TokL/MB1a9//O9TymFiSM57sFKquhq 3EvwWIqXByQQ8Gfvfi6RyXmhXU4FV6FngXgNxgrBofyJLSvSvfsyDiAlREdaGgok 6sDANNU7831pxijGUNWEw5vlE7ILrr/WH+bFuw/WM33gB7EVaOvdZ+O3mRLr1Mw+ P13Q6oXTucozDJGmjVo4f2gmxnLbx6xRXeAunl31NU1V8Cxlo39a+nXLd3D9Yz58 i7WUxFIEcm/2VDlKr/MzzN9T6C7Dlpx3O498umpq4hXvHx3l4vhJ+O13AuFqpnJe a05OWrBWkPX3UrMiuIttiHkTyJkH0ry6gN4/HlOVhMPgcspvC2UwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAI00unyTOrapnAw86gBmKRZ+M //uPCpz3/XHYlyyokmrZ7VGCt8RdGjsn9V7qQyTiSKboObYqYSTK+Sa5Dm5gg7GK B0Z4ulUg6da2v6ouyOliW0FWUf/cap/Q5nRxN1cKizfqr542GyCMYxHZVjwY+i4V 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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 In-Reply-To: References: MIIeHAYJKoZIhvcNAQcDoIIeDTCCHgkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHrX9uy/oQe7y+9tegYXxu2T9sAJqzKM2LCf sMR9WNLx5AZ1A8iQOHilviTas4EvYkPgJzfadPRq5lF98h1MGWaCpvYgKlbyVdu5 ubwR2pIkRpttWRULid17OwadsTnbL539iRWWzWMakKPEh00oSsrDAUbE2INawzzs H/ajSTjtFZoeVtwRH+c7+WiTsK+LO2MnbqBLhrIUjPXq753QToNcUYbj4iFWtnku gUFfdkhrcwmzEzOmM66L9kwqvnfqjpCbx8A5QOsVYGZc4nuXzgY4F8PYKtrGwq7c tLX+CPJ4X2rqH3KoqhhRu+TfeVtVR4RQ1TOPlYyFdjlGDqHbAC0wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAmCHkN9nwaIBtxA0yYkitWt8D lJ/Tj1uocqIubp1kShAIee33NF+5T0u7bNLseaqu5urdWlCk5z4Qh94iUA+En95C +kpTNvWtXyIoWgRX6C/TSup3ETM/DE6BpdKTM0VvzV3rNAkvIVzBocTYnULspM8L 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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 MIIcHAYJKoZIhvcNAQcDoIIcDTCCHAkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBABoiuTpkWhhfblL1RCZbuwLzmGm3w9XY0fj+ SDxw4qBddauIERLO6YUM7k29IGzo5RQXEr/+QU80QxKUEp2vjNSnGqGpLAj0VEy8 TI52mFbeqCPJ5LxD7SWOgmI3i4tuUWcwhlIkwj73sYwqd5pOl41etK8yVIBDqN1D uOwTKe9j9zyxHO7gl7GtWB5HJ5jAYmsoGv2bbg1T6JxlbOUmFwgV1R4g+33YiMin sjuHAZ0EmoFH7o58au/9BOfaVrWjOgjAdn1bJps58tByZjaBYekx2FHjhW1+Zi4Y sF1FEt1eDjxZ0Bm2rpaWw6ZeCUz50YnkymOS5mC7AT9biJtw8mgwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAY2tgCqi1NB7E4JtYGs2o2huW iyP3292KYFjvg29uqV7CkkBAasq/ejnunH/LBQQOGZJ+lratSdSqrlTBUE7PVKO9 pr3izAQpj7NLTbbT5ntI+17+I9SCf3gOiLXOq+f30/IAqXcLG+JgoSIBIiMitzUf 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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 MIIcPAYJKoZIhvcNAQcDoIIcLTCCHCkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAChSAmfqHyENXaa4Q2w2DOX1R3r9EC4cvYoT j19WfwiSgCZkQs08Aai9ARBMlXNRKV0NY9ocrCo+RAAv+2xgHyBbZAvZYGa2SmRT rSqdHUtXYXiWkBRjXHer7Yi+96T6zGZ5iUyz/aEJBc+DkFgkAkvIayyi5QH/uLz5 tjd096w8lzj2s/2UsloUHw/oCs7KpleZzI9j/6MP0f+vpTElu5G1WYmumgKrF7MS 68ABr7NlV+hkMkSXo2u1CzPamQjLqHRjxJco0LFubArK1Rknli1GcCb9dITJh/dI CPLaXPtgCNHE8ZL4b40reSbA9UEKTpxA03oNph5Qt2eZLdvwdr4wggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAAQkDtFs7ZNTe9O8FdkPkY3u/ BoxJYAVFN+1/NdDaSSZbp3FL6Z4zdwVSIo379RUtPSLfaOjQ9vYpDZJs2DiFoftP lQbDV/+SQWeCLRSuU2MJTr+W+xvgvVRG6pAERbPZemHtGCVo2hY0JqVt6U9vw8oZ 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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 MIIeDAYJKoZIhvcNAQcDoIId/TCCHfkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 Boq0MA0GCSqGSIb3DQEBAQUABIIBAIz93W2Y+UAs5hfJv0FVshsVqpt+3nDEwVwW 1CbA0ElWkeDUJEA3temKIObvlca8GuinuFRfBNobC6Qh74dtjjDjD2Vy3mi+VJ13 ERB/OM1wdrMRtdJrwTwV7zPC0rfHhpenbvNQpKsdszIVitiiHeG7dG2oRrJ6Jyfq ceU313EXthbLhXNRBA17tWRd4DtpBH9Wk+3M9v7tGQLOFW5sLczK+Btqgmed+/ns mQNfl/8T+aA5ttkzwHYYJJ/Fj6GMxWaKWLpGkGtE1V00ED2NpDHLNwciWMG3MgUC tT2aF5yASW93vBhV3Wg/gdw1p5zTF6RXI7/Z0tSE5PjLpyqYrWkwggGEAgEAMGww VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAbcc4GVOP/kh6RDuyhTj+6aj4 Vw/bzLNJYkgln3XsWd53MePIzQQ2m4/w2qMxeOFjCV0j0XA1FpKJH9XfUjeKKC9p WYYOLCu7zYgXD+9rsxA3EzG3EM0S6x1FI8l273MZ1mUNDFKWhl3e+PYyharTwa0N 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Additional information
Stored Variants of Messages with Bcc Messages containing at least one recipient address in the Bcc header field may appear in up to three different variants: The Message for the recipient addresses listed in To or Cc header fields, which must not include the Bcc header field neither for signature calculation nor for encryption. The Message(s) sent to the recipient addresses in the Bcc header field, which depends on the implementation: a) One Message for each recipient in the Bcc header field separately, with a Bcc header field containing only the address of the recipient it is sent to. b) The same Message for each recipient in the Bcc header field with a Bcc header field containing an indication such as "Undisclosed recipients", but no addresses. c) The same Message for each recipient in the Bcc header field which does not include a Bcc header field (this Message is identical to 1. / see above). The Message stored in the 'Sent'-Folder of the sender, which usually contains the Bcc unchanged from the original Message, i.e., with all recipient addresses. The most privacy preserving method of the alternatives (2a, 2b, and 2c) is to standardize 2a, as in the other cases (2b and 2c), information about hidden recipients is revealed via keys. In any case, the Message has to be cloned and adjusted depending on the recipient.
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 Considerations [[ RFC Editor: This section is to be removed before publication ]] This draft is built from markdown source, and its development is tracked in a git repository. You may also be interested in the latest editor's copy. While minor editorial suggestions and nit-picks can be made as merge requests, please direct all substantive discussion to the LAMPS mailing list at spasm@ietf.org.
Document Changelog [[ RFC Editor: This section is to be removed before publication ]] 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
Open Issues [[ RFC Editor: This section should be empty and is to be removed before publication. ]] Ensure "protected header" (Ex-Memory-Hole) option is (fully) compliant with the MIME standard, in particular also , Section 5.1. (Multipart Media Type). Decide on whether or not merge requirements from into this document. Decide on whether or not specification for more legacy HP requirements should be added to this document. Verify ability to distinguish between Messages with Header Protection as specified in this document and messages without header protection, and update receiving guidance accordingly. Privacy Considerations Security Considerations