Distributing OpenPGP Key Fingerprints with Signed Keylist Subscriptions
draft-mccain-keylist-04

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Last updated 2019-03-06
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Network Working Group                                          M. McCain
Internet-Draft                                                       FLM
Intended status: Standards Track                                  M. Lee
Expires: September 7, 2019                                            TI
                                                                N. Welch
                                                                  Google
                                                           March 6, 2019

Distributing OpenPGP Key Fingerprints with Signed Keylist Subscriptions
                        draft-mccain-keylist-04

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, 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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 7, 2019.

McCain, et al.          Expires September 7, 2019               [Page 1]
Internet-Draft        OpenPGP Keylist Subscriptions           March 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  . . . . . . . . .   5
   3.  Data Element Formats  . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Keylist . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Signature . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Well-Known URL  . . . . . . . . . . . . . . . . . . . . .   7
   4.  Implementation Status . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Benefits . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Relation to Other Technologies  . . . . . . . . . . . . . . .   8
     6.1.  Web Key Directories . . . . . . . . . . . . . . . . . . .   8
     6.2.  OPENPGPKEY DNS Records  . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   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.
   This system enhances operational security by allowing seamless key
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