Russ, I have no need or desire for the truncated tags. I added them only because it was suggested by John M for IoT cases and the existing MAC alg registrations use 64 bit tags. I'm open to any WG consensus about which fully specified parameters are most appropriate. Brian S.
On Mon, Mar 23, 2026, 16:49 Russ Housley <[email protected]> wrote: > Brian: > > Why do you think 64 bit authentication tags are desirable? I would be > much more comfortable with 96 bits. > > Russ > > > On Mar 23, 2026, at 10:47 AM, Brian Sipos <[email protected]> > wrote: > > COSE WG, > I have updated the individual draft referenced below based on the feedback > so far. For the explanatory updates I think the new text is more clear > about what is meant and about which sections some statements belong in. > Part of this update adds truncated MAC tags, as suggested, which align with > the strengths of existing registered MAC algorithms. > > With these changes, and from comments received so far, I think this draft > is ready for an adoption call. Thanks for the support so far! > > Brian S. > > ---------- Forwarded message --------- > From: <[email protected]> > Date: Mon, Mar 23, 2026 at 10:30 AM > Subject: New Version Notification for draft-sipos-cose-cmac-01.txt > To: Brian Sipos <[email protected]> > > > A new version of Internet-Draft draft-sipos-cose-cmac-01.txt has been > successfully submitted by Brian Sipos and posted to the > IETF repository. > > Name: draft-sipos-cose-cmac > Revision: 01 > Title: AES-CMAC for COSE > Date: 2026-03-23 > Group: Individual Submission > Pages: 7 > URL: https://www.ietf.org/archive/id/draft-sipos-cose-cmac-01.txt > Status: https://datatracker.ietf.org/doc/draft-sipos-cose-cmac/ > HTML: https://www.ietf.org/archive/id/draft-sipos-cose-cmac-01.html > HTMLized: https://datatracker.ietf.org/doc/html/draft-sipos-cose-cmac > Diff: > https://author-tools.ietf.org/iddiff?url2=draft-sipos-cose-cmac-01 > > Abstract: > > This document registers code points for using the Advanced Encryption > Standard (AES) block cipher in Cipher-based Message Authentication > Code (CMAC) mode within CBOR Object Signing and Encryption (COSE) > messages. Specifically, these uses are for computing authentication > tag values with no additional parameters. > > > > The IETF Secretariat > > > _______________________________________________ > COSE mailing list -- [email protected] > To unsubscribe send an email to [email protected] > > >
_______________________________________________ COSE mailing list -- [email protected] To unsubscribe send an email to [email protected]
