pretty Easy privacy (pEp): Email Formats and Protocols
draft-marques-pep-email-02

Document Type Active Internet-Draft (individual)
Last updated 2018-10-23
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                         H. Marques
Internet-Draft                                            pEp Foundation
Intended status: Standards Track                        October 24, 2018
Expires: April 27, 2019

         pretty Easy privacy (pEp): Email Formats and Protocols
                       draft-marques-pep-email-02

Abstract

   The pretty Easy privacy (pEp) propositions for email are based upon
   already existing email and encryption formats (i.e., PGP/MIME) and
   designed to allow for easy implementable and interoperable
   opportunistic encryption: this ranging from key distribution to
   mechanisms of subject encryption.

   The goal of pEp for email is to automatize operations in order to
   make email encryption usable by a wider range of Internet users, to
   achieve wide application of confidentiality and privacy practices in
   the real world.

   This document defines basic operations of pEp's approach towards
   email and two PGP/MIME formats (pEp Email Format 1 and 2) to provide
   certain security guarantees.

   The proposed operations and formats are targeted to Opportunistic
   Security scenarios and are already implemented in several
   applications of pretty Easy privacy (pEp).

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 April 27, 2019.

Marques                  Expires April 27, 2019                 [Page 1]
Internet-Draft       pretty Easy privacy (pEp) Email        October 2018

Copyright Notice

   Copyright (c) 2018 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 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
   2.  Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Opportunistic Security with pEp for email . . . . . . . . . .   5
     3.1.  Automatic keypair generation  . . . . . . . . . . . . . .   5
     3.2.  Key Distribution  . . . . . . . . . . . . . . . . . . . .   5
   4.  Encryption of email header fields and interoperability  . . .   6
   5.  pEp message formats for email . . . . . . . . . . . . . . . .   6
     5.1.  Unencrypted plain text message with public key attached .   6
       5.1.1.  Example . . . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  pEp email format version 1  . . . . . . . . . . . . . . .   7
       5.2.1.  Example 1 . . . . . . . . . . . . . . . . . . . . . .   8
       5.2.2.  Example 2 . . . . . . . . . . . . . . . . . . . . . .   9
     5.3.  pEp email format version 2  . . . . . . . . . . . . . . .  11
       5.3.1.  Example (Outer and Inner Message) . . . . . . . . . .  11
   6.  Rendering Incoming Messages and Message Rating  . . . . . . .  13
   7.  Encryption to Bcc recipients  . . . . . . . . . . . . . . . .  14
     7.1.  Algorithm . . . . . . . . . . . . . . . . . . . . . . . .  14
       7.1.1.  Split To and Cc recipients from Bcc recipients  . . .  15
       7.1.2.  Split Bcc recipients in two groups  . . . . . . . . .  15
       7.1.3.  Send one email with only To/Cc recipients . . . . . .  15
       7.1.4.  Send one Bcc email for the first Bcc group  . . . . .  15
       7.1.5.  Send individual Bcc emails for the second group . . .  15
   8.  Saving messages . . . . . . . . . . . . . . . . . . . . . . .  15
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   10. Implementation Status . . . . . . . . . . . . . . . . . . . .  16
     10.1.  Introduction . . . . . . . . . . . . . . . . . . . . . .  16
     10.2.  Current software implementing pEp  . . . . . . . . . . .  16
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  17
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  17
Show full document text