Hi Hannes,

Thanks for the quick turn update - but I will not you deleted the sentence 
prior to this in 3.3.2:

> `The COSE_recipient structure is computed for each recipient.`
>
> so its still in there twice and you deleted a useful line of text. :D
>

—
Chris Inacio
SEC AD

> On Monday, Jun 29, 2026 at 7:50 AM, Hannes Tschofenig 
> <[email protected] (mailto:[email protected])> wrote:
>
> Hi Chris!
>
>
> Thanks for carefully reviewing the draft. I have updated it accordingly.
>
>
> Regarding the implementations, I was not planning to add an implementation 
> status section to the draft but you can find them here:
>
>
> - Orie: https://github.com/tradeverifyd/cose-hpke
>
>
> - Daisuke: https://github.com/dajiaji/python-cwt
>
>
> - Mine: 
> https://github.com/hannestschofenig/t_cose/blob/new_hpke/GUIDE_COSE_HPKE.md
>
>
> There may be others but those implementations were used for interop testing 
> and for the test vectors in the draft.
>
>
> Ciao
> Hannes
>
>
>
>
>
> Am 27.06.2026 um 17:42 schrieb Christopher Inacio:
> > Hello,
> >
> > First, thanks for the well constructed draft, it’s quite readable.
> >
> > I have some questions and comments for my review:
> >
> > * Section 3.3.2, this line/paragraph is stated twice:
> > `The COSE_recipient structure is computed for each recipient.`
> >
> > * Section 4: can this paragraph
> >
> > `As a guideline for ciphersuite submissions to the IANA COSE algorithm 
> > registry, the designated experts must only register combinations of (KEM, 
> > KDF, AEAD) triple that constitute valid combinations for use with HPKE, the 
> > KDF used should (if possible) match one internally used by the KEM, and 
> > components should not be mixed between global and national standards.`
> >
> > be turned into a sub-section possibly and labaled “Designated Expert 
> > Guidance”? That really helps any further disagreements about possible 
> > future registrations.
> >
> > * I will agree with the Shepherd write up (thanks for the diligence in 
> > preparing it): an "implementation status” section would be nice. I 
> > certainly will NOT block if this doesn’t happen.
> >
> >
> >
> > Thanks,
> > —
> > Chris Inacio
> > SEC AD
> >
> >
> >
> > _______________________________________________ COSE mailing list -- 
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> > [email protected] (mailto:[email protected])

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