I support the publication of this document. I just have a few non-blocking 
comments:

- The motivation stated for the use of AKP seems ambiguous to me: "This ensures 
compatibility across different cryptographic algorithms that use AKP for key 
representation." What does "compatibility" mean here?

- I would not use the term "nonces" in Section 5.4, which doesn’t appear in 
FIPS 205.

- "KeyValidate" isn't defined in the draft.

- Would it be relevant to also mention alternative solutions for JOSE in 
Section 5.1, as only COSE Hash Envelope is discussed?

Thanks to the authors for working on this document,

Best,

Lucas

From: Ivaylo Petrov <[email protected]>
Sent: 24 March 2026 18:58
To: cose <[email protected]>
Cc: Cose Chairs Wg <[email protected]>; [email protected]
Subject: [COSE] WGLC: draft-ietf-cose-sphincs-plus-07 (Ends 2026-04-14)

Dear COSE WG members,

As discussed during IETF 125, this message starts a WG Last Call (WGLC) for:
https://datatracker.ietf.org/doc/draft-ietf-cose-sphincs-plus/

Please review and indicate your support or objection to proceeding with the
publication of this document by replying to this email keeping 
[email protected]<mailto:[email protected]>
in copy. Please provide rationale for support and explanations or suggestions
for objections.

This Working Group Last Call ends on 2026-04-14

                                                            Thank you,
                                                            -- Mike and Ivo
                                                            COSE co-chairs


Please note:
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