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DomainKeys Identified Mail (DKIM) Signatures
RFC 6376

Internet Engineering Task Force (IETF)                   D. Crocker, Ed.
Request for Comments: 6376                   Brandenburg InternetWorking
Obsoletes: 4871, 5672                                     T. Hansen, Ed.
Category: Standards Track                              AT&T Laboratories
ISSN: 2070-1721                                        M. Kucherawy, Ed.
                                                               Cloudmark
                                                          September 2011

              DomainKeys Identified Mail (DKIM) Signatures

Abstract

   DomainKeys Identified Mail (DKIM) permits a person, role, or
   organization that owns the signing domain to claim some
   responsibility for a message by associating the domain with the
   message.  This can be an author's organization, an operational relay,
   or one of their agents.  DKIM separates the question of the identity
   of the Signer of the message from the purported author of the
   message.  Assertion of responsibility is validated through a
   cryptographic signature and by querying the Signer's domain directly
   to retrieve the appropriate public key.  Message transit from author
   to recipient is through relays that typically make no substantive
   change to the message content and thus preserve the DKIM signature.

   This memo obsoletes RFC 4871 and RFC 5672.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6376.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Crocker, et al.              Standards Track                    [Page 1]
RFC 6376                     DKIM Signatures              September 2011

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  DKIM Architecture Documents  . . . . . . . . . . . . . . .  5
     1.2.  Signing Identity . . . . . . . . . . . . . . . . . . . . .  5
     1.3.  Scalability  . . . . . . . . . . . . . . . . . . . . . . .  5
     1.4.  Simple Key Management  . . . . . . . . . . . . . . . . . .  6
     1.5.  Data Integrity . . . . . . . . . . . . . . . . . . . . . .  6
   2.  Terminology and Definitions  . . . . . . . . . . . . . . . . .  6
     2.1.  Signers  . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.2.  Verifiers  . . . . . . . . . . . . . . . . . . . . . . . .  7
     2.3.  Identity . . . . . . . . . . . . . . . . . . . . . . . . .  7
     2.4.  Identifier . . . . . . . . . . . . . . . . . . . . . . . .  7
     2.5.  Signing Domain Identifier (SDID) . . . . . . . . . . . . .  7
     2.6.  Agent or User Identifier (AUID)  . . . . . . . . . . . . .  7
     2.7.  Identity Assessor  . . . . . . . . . . . . . . . . . . . .  7
     2.8.  Whitespace . . . . . . . . . . . . . . . . . . . . . . . .  8
     2.9.  Imported ABNF Tokens . . . . . . . . . . . . . . . . . . .  8
     2.10. Common ABNF Tokens . . . . . . . . . . . . . . . . . . . .  9
     2.11. DKIM-Quoted-Printable  . . . . . . . . . . . . . . . . . .  9

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