Using Multiple Signing Algorithms with the ARC (Authenticated Received Chain) Protocol
draft-ietf-dmarc-arc-multi-03

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DMARC Working Group                                          K. Andersen
Internet-Draft                                                  LinkedIn
Intended status: Experimental                              S. Blank, Ed.
Expires: September 8, 2019                                      ValiMail
                                                          J. Levine, Ed.
                                                    Taughannock Networks
                                                           March 7, 2019

 Using Multiple Signing Algorithms with the ARC (Authenticated Received
                            Chain) Protocol
                     draft-ietf-dmarc-arc-multi-03

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

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   This Internet-Draft will expire on September 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Andersen, et al.        Expires September 8, 2019               [Page 1]
Internet-Draft                  ARC-Multi                     March 2019

   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  . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Phases of Algorithm Evolution . . . . . . . . . . . . . . . .   4
     6.1.  Introductory Period . . . . . . . . . . . . . . . . . . .   4
     6.2.  Co-Existence Period . . . . . . . . . . . . . . . . . . .   4
     6.3.  Deprecation Period  . . . . . . . . . . . . . . . . . . .   4
     6.4.  Obsolescence Period . . . . . . . . . . . . . . . . . . .   4
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   4
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   5
     10.2.  Informative References . . . . . . . . . . . . . . . . .   5
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   6
   Appendix B.  Comments and Feedback  . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

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 September 8, 2019               [Page 2]
Internet-Draft                  ARC-Multi                     March 2019