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
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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
datatracker.ietf.org