Taxonomy of Composite Attesters
draft-richardson-rats-composite-attesters-05

RATS Working Group                                         M. Richardson
Internet-Draft                                  Sandelman Software Works
Intended status: Informational                               H. Birkholz
Expires: 3 March 2027                                     Fraunhofer SIT
                                                            Y. Deshpande
                                                                     Arm
                                                              T. Fossati
                                                                  Linaro
                                                          30 August 2026

                    Taxonomy of Composite Attesters
              draft-richardson-rats-composite-attesters-05

Abstract

   This document was attempting to clarifys and extends the meaning of
   Composite Attester from RFC9334.  It has since been moved into the
   RATS wiki, and this I-D serves as a tombstone.

   A system of annotated diagram components is defined as a small
   language to explain the different ways that components can interact
   to form composites.

   These diagram components are then used to define a few popular
   classes of composites.

About This Document

   This note is to be removed before publishing as an RFC.

   Status information for this document may be found at
   https://datatracker.ietf.org/doc/draft-richardson-rats-composite-
   attesters/.

   Discussion of this document takes place on the rats Working Group
   mailing list (mailto:rats@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/browse/rats/.  Subscribe at
   https://www.ietf.org/mailman/listinfo/rats/.

   Source for this draft and an issue tracker can be found at
   https://github.com/mcr/composite-attesters.

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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Copyright Notice

   Copyright (c) 2026 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   3.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   This document was attempting to clarify and extend the meaning of
   Composite Attester from [RFC9334], Section 3.3.

   This work has been moved into the RATS wiki at:
   https://wiki.ietf.org/group/rats/atomic-composites

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2.  IANA Considerations

   There are none.

3.  Acknowledgements

   Jun Zhang contributed the terms "Le Petit" and "Le Grand" to qualify
   Verifier, the original thought for Class 5 Composite Atteser and the
   description of the Nonce architecture.

4.  Changelog

5.  References

5.1.  Normative References

   [I-D.ietf-rats-msg-wrap]
              Birkholz, H., Smith, N., Fossati, T., Tschofenig, H., and
              D. Glaze, "RATS Conceptual Messages Wrapper (CMW)", Work
              in Progress, Internet-Draft, draft-ietf-rats-msg-wrap-23,
              11 December 2025, <https://datatracker.ietf.org/doc/html/
              draft-ietf-rats-msg-wrap-23>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC9334]  Birkholz, H., Thaler, D., Richardson, M., Smith, N., and
              W. Pan, "Remote ATtestation procedureS (RATS)
              Architecture", RFC 9334, DOI 10.17487/RFC9334, January
              2023, <https://www.rfc-editor.org/info/rfc9334>.

5.2.  Informative References

   [I-D.ffm-rats-cca-token]
              Frost, S., Fossati, T., and G. Mandyam, "Arm's
              Confidential Compute Architecture Reference Attestation
              Token", Work in Progress, Internet-Draft, draft-ffm-rats-
              cca-token-03, 2 March 2026,
              <https://datatracker.ietf.org/doc/html/draft-ffm-rats-cca-
              token-03>.

   [TCG-DICE] Trusted Computing Group, "DICE Layering Architecture",
              Version 1.0, Revision 0.19 , July 2020,
              <https://trustedcomputinggroup.org/wp-content/uploads/
              DICE-Layering-Architecture-r19_pub.pdf>.

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Authors' Addresses

   Michael Richardson
   Sandelman Software Works
   Email: mcr+ietf@sandelman.ca

   Henk Birkholz
   Fraunhofer SIT
   Email: henk.birkholz@ietf.contact

   Yogesh Deshpande
   Arm
   Email: yogesh.deshpande@arm.com

   Thomas Fossati
   Linaro
   Email: thomas.fossati@linaro.org

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