Problem Statement and Requirements for Header Protection
draft-ietf-lamps-header-protection-requirements-01

Document Type Active Internet-Draft (lamps WG)
Last updated 2019-10-29
Replaces draft-melnikov-lamps-header-protection
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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Informational                              B. Hoeneisen
Expires: April 30, 2020                                          Ucom.ch
                                                        October 28, 2019

        Problem Statement and Requirements for Header Protection
           draft-ietf-lamps-header-protection-requirements-01

Abstract

   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.

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
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   This Internet-Draft will expire on April 30, 2020.

Copyright Notice

   Copyright (c) 2019 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

Melnikov & Hoeneisen     Expires April 30, 2020                 [Page 1]
Internet-Draft       Header Protection requirements         October 2019

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.2.  Terms . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Privacy . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Security  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Usability . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Interoperability  . . . . . . . . . . . . . . . . . . . .   5
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Interactions  . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Protection Levels . . . . . . . . . . . . . . . . . . . .   6
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  General Requirements  . . . . . . . . . . . . . . . . . .   7
       4.1.1.  Sending Side  . . . . . . . . . . . . . . . . . . . .   7
       4.1.2.  Receiving Side  . . . . . . . . . . . . . . . . . . .   8
     4.2.  Additional Requirements for Backward-Compatibility With
           Legacy Clients Unaware of Header Protection . . . . . . .   8
       4.2.1.  Sending side  . . . . . . . . . . . . . . . . . . . .   8
       4.2.2.  Receiving side  . . . . . . . . . . . . . . . . . . .   9
     4.3.  Additional Requirements for Backward-Compatibility with
           Legacy Header Protection Systems (if supported) . . . . .   9
       4.3.1.  Sending Side  . . . . . . . . . . . . . . . . . . . .   9
       4.3.2.  Receiving Side  . . . . . . . . . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Implementation Considerations  . . . . . . . . . . .  12
     A.1.  Options to Achieve Header Protection  . . . . . . . . . .  12
       A.1.1.  Option 1: Memory Hole . . . . . . . . . . . . . . . .  12
       A.1.2.  Option 2: Wrapping with message/rfc822 or
               message/global  . . . . . . . . . . . . . . . . . . .  12
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