DomainKeys Identified Mail (DKIM) Authorized Third-Party Signatures
RFC 6541
Document | Type |
RFC - Experimental
(February 2012; No errata)
Was draft-kucherawy-dkim-atps (individual in sec area)
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Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text pdf html bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6541 (Experimental) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Sean Turner | ||
IESG note | Barry Leiba (barryleiba@computer.org) is the document shepherd. | ||
Send notices to | barryleiba@computer.org |
Internet Engineering Task Force (IETF) M. Kucherawy Request for Comments: 6541 Cloudmark, Inc. Category: Experimental February 2012 ISSN: 2070-1721 DomainKeys Identified Mail (DKIM) Authorized Third-Party Signatures Abstract This experimental specification proposes a modification to DomainKeys Identified Mail (DKIM) allowing advertisement of third-party signature authorizations that are to be interpreted as equivalent to a signature added by the administrative domain of the message's author. Status of This Memo This document is not an Internet Standards Track specification; it is published for examination, experimental implementation, and evaluation. This document defines an Experimental Protocol for the Internet community. 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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc6541. Copyright Notice Copyright (c) 2012 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 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. Kucherawy Experimental [Page 1] RFC 6541 DKIM ATPS Experiment February 2012 Table of Contents 1. Introduction ....................................................2 2. Definitions .....................................................3 2.1. Key Words ..................................................3 2.2. Email Architecture Terminology .............................3 3. Roles and Scope .................................................3 4. Queries and Replies .............................................4 4.1. Hash Selection .............................................4 4.2. Extension to DKIM ..........................................5 4.3. ATPS Query Details .........................................5 4.4. ATPS Reply Details .........................................7 5. Interpretation ..................................................8 6. Relationship to ADSP ............................................8 7. Experiment Process ..............................................8 8. IANA Considerations .............................................9 8.1. ATPS Tag Registry ..........................................9 8.2. Email Authentication Methods Registry Update ..............10 8.3. Email Authentication Result Names Registry Update .........10 8.4. DKIM Signature Tag Specifications Registry ................12 9. Security Considerations ........................................12 9.1. Hash Selection ............................................12 9.2. False Privacy .............................................12 9.3. Transient Security Failures ...............................13 9.4. Load on the DNS ...........................................13 10. References ....................................................13 10.1. Normative References .....................................13 10.2. Informative References ...................................14 Appendix A. Example Query and Reply ...............................15 Appendix B. Choice of DNS RR Type .................................15 Appendix C. Acknowledgements ......................................16 1. Introduction [DKIM] defines a mechanism for transparent domain-level signing of messages for the purpose of declaring that a particular ADministrative Management Domain (ADMD) takes some responsibility for a message. DKIM, however, deliberately makes no binding between the DNS domain of the Signer and any other identity found in the message. Despite this, there is an automatic human perception that an Author Domain Signature (one for which the RFC5322.From domain matches the DNS domain of the Signer) is more valuable or trustworthy than any other. To enable a third party to apply DKIM signatures to messages, theShow full document text