(Deprecated) Protected E-mail Headers
draft-autocrypt-lamps-protected-headers-04

openpgp                                                  B. R. Einarsson
Internet-Draft                                              Mailpile ehf
Intended status: Informational                                      juga
Expires: 6 March 2026                                        Independent
                                                           D. K. Gillmor
                                                                    ACLU
                                                        2 September 2025

                 (Deprecated) Protected E-mail Headers
               draft-autocrypt-lamps-protected-headers-04

Abstract

   This is a tombstone document of an abandoned effort to provide end-
   to-end cryptographic protections for e-mail headers.  It has been
   superseded by RFC 9788.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 6 March 2026.

Copyright Notice

   Copyright (c) 2025 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

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Table of Contents

   1.  This Document Is Deprecated . . . . . . . . . . . . . . . . .   2
   2.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Normative References  . . . . . . . . . . . . . . . . . .   2
     2.2.  Informative References  . . . . . . . . . . . . . . . . .   2
   Appendix A.  Document History . . . . . . . . . . . . . . . . . .   2
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  This Document Is Deprecated

   This document has been superseded by [RFC9788].

2.  References

2.1.  Normative References

   [RFC9788]  Gillmor, D. K., Hoeneisen, B., and A. Melnikov, "Header
              Protection for Cryptographically Protected Email",
              RFC 9788, DOI 10.17487/RFC9788, August 2025,
              <https://www.rfc-editor.org/rfc/rfc9788>.

2.2.  Informative References

   [Autocrypt]
              "Autocrypt Specification 1.1", 13 October 2019,
              <https://autocrypt.org/level1.html>.

   [OpenPGP-Email-Summit-2019]
              "OpenPGP Email Summit 2019", 13 October 2019,
              <https://wiki.gnupg.org/OpenPGPEmailSummit201910>.

   [xkcd936]  Munroe, R., "xkcd: Password Strength", 10 August 2011,
              <https://www.xkcd.com/936/>.

Appendix A.  Document History

   Significant changes between version -03 and -04:

   *  Update "Tombstone" to point to released RFC9788.

   Significant changes between version -02 and -03:

   *  "Tombstone" this document in favor of draft-ietf-lamps-header-
      protection

   Significant changes between version -01 and -02:

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   *  Added S/MIME test vectors in addition to PGP/MIME

   *  Legacy Display parts should now be text/plain and not text/
      rfc822-headers

   *  Cryptographic Payload must have protected-headers parameter set to
      v1

   *  Test vector sample Message-Ids have been normalized

   *  Added encrypted-only (unsigned) test vectors, at the suggestion of
      Russ Housley

   Changes between version -00 and -01:

   *  Credit Randall for "correct horse battery staple".

   *  Adjust test vectors to ensure no line in the generated .txt format
      exceeds 72 chars.

   *  Minor formatting cleanup to appease idnits.

   *  Update references to more recent documents (RFC 2822 -> 5322, -00
      to -01 of draft-ietf-lamps-header-protection-requirements).

Appendix B.  Acknowledgements

   The set of constructs and algorithms in this document has a previous
   working title of "Memory Hole", but that title is no longer used as
   different implementations gained experience in working with it.

   These ideas were tested and fine-tuned in part by the loose
   collaboration of MUA developers known as [Autocrypt].

   Additional feedback and useful guidance was contributed by attendees
   of the OpenPGP e-mail summit ([OpenPGP-Email-Summit-2019]).

   The following people have contributed implementation experience,
   documentation, critique, and other feedback:

   *  Holger Krekel

   *  Patrick Brunschwig

   *  Vincent Breitmoser

   *  Edwin Taylor

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   *  Alexey Melnikov

   *  Russ Housley

   The password example used in previous versions comes from [xkcd936].

Authors' Addresses

   Bjarni Rúnar Einarsson
   Mailpile ehf
   Baronsstigur
   Iceland
   Email: bre@mailpile.is

   juga
   Independent
   Email: juga@riseup.net

   Daniel Kahn Gillmor
   American Civil Liberties Union
   125 Broad St.
   New York, NY,  10004
   United States of America
   Email: dkg@fifthhorseman.net

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