Using DANE to Associate OpenPGP public keys with email addresses
draft-ietf-dane-openpgpkey-01

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Network Working Group                                    P. Wouters, Ed.
Internet-Draft                                                   Red Hat
Intended status: Standards Track                        October 27, 2014
Expires: April 30, 2015

    Using DANE to Associate OpenPGP public keys with email addresses
                     draft-ietf-dane-openpgpkey-01

Abstract

   OpenPGP is a message format for email (and file) encryption, that
   lacks a standarized lookup mechanism to obtain OpenPGP public keys.
   This document specifies a standarized method for securely publishing
   and locating OpenPGP public keys in DNS using a new OPENPGPKEY DNS
   Resource Record.

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 http://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 30, 2015.

Copyright Notice

   Copyright (c) 2014 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
   (http://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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  The OPENPGPKEY Resource Record  . . . . . . . . . . . . . . .   3
     2.1.  The OPENPGPKEY RDATA component  . . . . . . . . . . . . .   3
     2.2.  The OPENPGPKEY RDATA wire format  . . . . . . . . . . . .   3
     2.3.  The OPENPGPKEY RDATA presentation format  . . . . . . . .   3
   3.  Location of the OpenPGPKEY record . . . . . . . . . . . . . .   4
   4.  OpenPGP Key size and DNS  . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
     5.1.  Email address information leak  . . . . . . . . . . . . .   5
     5.2.  Forward security of OpenPGP versus DNSSEC . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  OPENPGPKEY RRtype . . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  Generating OPENPGPKEY records  . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   To encrypt a message to a target recipient using OpenPGP [RFC4880],
   possession of the recipient's OpenPGP public key is required.  To
   obtain that public key, two problems need to be solved by the
   sender's email client, MUA or MTA.  Where does one find the
   recipient's public key and how does one trust that the found key
   actually belongs to the intended recipient.

   Obtaining a public key is not a straightforward process as there are
   no trusted standarized locations for publishing OpenPGP public keys
   indexed by email address.  Instead, OpenPGP clients rely on "well-
   known key servers" that are accessed using the web based HKP protocol
   or manually by users using a variety of differently formatted front-
   end web pages.

   Currently deployed key servers have no method of validating any
   uploaded OpenPGP public key.  The key servers simply store and
   publish.  Anyone can add public keys with any identities and anyone
   can add signatures to any other public key using forged malicious
   identities.  Furthermore, once uploaded, public keys cannot be
   deleted.  People who did not pre-sign a key revocation can never
   remove their public key from these key servers once they lost their
   private key.

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