DomainKeys Identified Mail (DKIM) Signatures
RFC 6376
Document | Type |
RFC - Internet Standard
(September 2011; Errata)
Status changed by status-change-dkim-to-internetstandard
Also known as STD 76
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Authors | Murray Kucherawy , Dave Crocker , Tony Hansen | ||
Last updated | 2020-01-21 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Barry Leiba | ||
Shepherd write-up | Show (last changed 2011-05-25) | ||
IESG | IESG state | RFC 6376 (Internet Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Sean Turner | ||
IESG note | Barry Leiba (barryleiba@computer.org) is the document shepherd. | ||
Send notices to | (None) |
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 (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 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. 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 3. Protocol Elements . . . . . . . . . . . . . . . . . . . . . . 10 3.1. Selectors . . . . . . . . . . . . . . . . . . . . . . . . 10Show full document text