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. Richardson, et al. Expires 3 March 2027 [Page 1] Internet-Draft composites August 2026 Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 3 March 2027. Copyright Notice Copyright (c) 2026 IETF Trust and the persons identified as the document authors. All rights reserved. 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 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. 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 Richardson, et al. Expires 3 March 2027 [Page 2] Internet-Draft composites August 2026 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, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [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, . 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, . [TCG-DICE] Trusted Computing Group, "DICE Layering Architecture", Version 1.0, Revision 0.19 , July 2020, . Richardson, et al. Expires 3 March 2027 [Page 3] Internet-Draft composites August 2026 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 Richardson, et al. Expires 3 March 2027 [Page 4]