Using Multiple Signing Algorithms with the ARC (Authenticated Received Chain) Protocol
draft-ietf-dmarc-arc-multi-00

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Last updated 2018-01-22
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DMARC Working Group                                          K. Andersen
Internet-Draft                                                  LinkedIn
Intended status: Experimental                              S. Blank, Ed.
Expires: July 26, 2018                                          ValiMail
                                                          J. Levine, Ed.
                                                    Taughannock Networks
                                                        January 22, 2018

 Using Multiple Signing Algorithms with the ARC (Authenticated Received
                            Chain) Protocol
                     draft-ietf-dmarc-arc-multi-00

Abstract

   The Authenticated Received Chain (ARC) protocol creates a mechanism
   whereby a series of handlers of an email message can conduct
   authentication of the email message as it passes among them on the
   way to its destination.

   Initial development of ARC has been done with a single allowed
   signing algorithm, but parallel work in the DCRUP working group
   (https://datatracker.ietf.org/wg/dcrup/about/) is expanding the
   supported algorithms.  This specification defines how to extend ARC
   for multiple signing algorithms.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on July 26, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Andersen, et al.          Expires July 26, 2018                 [Page 1]
Internet-Draft                  ARC-Multi                   January 2018

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Definitions and Terminology . . . . . . . . . . . . . . . . .   3
   4.  Supporting Alternate Signing Algorithms . . . . . . . . . . .   3
   5.  General Approach  . . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Signers . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.2.  Validators  . . . . . . . . . . . . . . . . . . . . . . .   3
   6.  Phases of Algorithm Evolution . . . . . . . . . . . . . . . .   3
     6.1.  Introductory Period . . . . . . . . . . . . . . . . . . .   3
     6.2.  Co-Existence Period . . . . . . . . . . . . . . . . . . .   4
     6.3.  Deprecation Period  . . . . . . . . . . . . . . . . . . .   4
     6.4.  Obsolescence Period . . . . . . . . . . . . . . . . . . .   4
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   4
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   4
     10.2.  Informative References . . . . . . . . . . . . . . . . .   6
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   7
   Appendix B.  Comments and Feedback  . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The Authenticated Received Chain (ARC) protocol adds a traceable
   chain of signatures that cover the handling of an email message
   through a chain of intermediary handlers.

   Initial development of ARC has been done with a single allowed
   signing algorithm, but parallel work in the DCRUP working group
   (https://datatracker.ietf.org/wg/dcrup/about/) is expanding the
   supported algorithms.  This specification defines how to extend ARC
   for multiple signing algorithms.

Andersen, et al.          Expires July 26, 2018                 [Page 2]
Internet-Draft                  ARC-Multi                   January 2018
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