Using Multiple Signing Algorithms with the ARC (Authenticated Received Chain) Protocol
draft-ietf-dmarc-arc-multi-02

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DMARC Working Group                                          K. Andersen
Internet-Draft                                                  LinkedIn
Intended status: Experimental                              S. Blank, Ed.
Expires: March 14, 2019                                         ValiMail
                                                          J. Levine, Ed.
                                                    Taughannock Networks
                                                      September 10, 2018

 Using Multiple Signing Algorithms with the ARC (Authenticated Received
                            Chain) Protocol
                     draft-ietf-dmarc-arc-multi-02

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 RFC 8463 has expanded 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 March 14, 2019.

Copyright Notice

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

Andersen, et al.         Expires March 14, 2019                 [Page 1]
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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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 RFC 8463 expanded the supported algorithms.
   This specification defines how to extend ARC for multiple signing
   algorithms.

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2.  Overview

   In order to phase in new signing algorithms, this specification
   identifies how signers and validators process ARC sets found in email