Distributing OpenPGP Key Fingerprints with Signed Keylist Subscriptions
draft-mccain-keylist-05

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Network Working Group                                          M. McCain
Internet-Draft                                                       FLM
Intended status: Standards Track                                  M. Lee
Expires: March 5, 2020                                                TI
                                                                N. Welch
                                                                  Google
                                                       September 2, 2019

Distributing OpenPGP Key Fingerprints with Signed Keylist Subscriptions
                        draft-mccain-keylist-05

Abstract

   This document specifies a system by which an OpenPGP client may
   subscribe to an organization's public keylist to keep its keystore
   up-to-date with correct keys from the correct keyserver(s), even in
   cases where the keys correspond to multiple (potentially
   uncontrolled) domains.  Ensuring that all members or followers of an
   organization have their colleagues' most recent PGP public keys is
   critical to maintaining operational security.  Without the most
   recent keys' fingerprints and a source of trust for those keys (as
   this document specifies), users must manually update and sign each
   others' keys -- a system that is untenable in larger organizations.
   This document proposes a experimental format for the keylist file as
   well as requirements for clients who wish to implement this
   experimental keylist subscription functionality.

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
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   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 March 5, 2020.

McCain, et al.            Expires March 5, 2020                 [Page 1]
Internet-Draft        OpenPGP Keylist Subscriptions       September 2019

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
   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Notation . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Note to Readers . . . . . . . . . . . . . . . . . . . . .   3
   2.  Functions and Procedures  . . . . . . . . . . . . . . . . . .   4
     2.1.  Subscribing to Keylists . . . . . . . . . . . . . . . . .   4
     2.2.  Automatic Updates . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Cryptographic Verification of Keylists  . . . . . . . . .   6
   3.  Data Element Formats  . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Keylist . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Signature . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Well-Known URL  . . . . . . . . . . . . . . . . . . . . .   8
   4.  Implementation Status . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Benefits . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Relation to Other Technologies  . . . . . . . . . . . . . . .   8
     6.1.  Web Key Directories . . . . . . . . . . . . . . . . . . .   9
     6.2.  OPENPGPKEY DNS Records  . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This document specifies a system by which clients may subscribe to
   cryptographically signed 'keylists' of public key fingerprints.  The
   public keys do not necesssarily all correspond to a single domain.