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Re: [COSE] [jose] Fwd: New Version Notification for draft-reddy-cose-jose-pqc-kem-00.txt

tirumal reddy <kondtir@gmail.com> Wed, 06 March 2024 09:53 UTC

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From: tirumal reddy <kondtir@gmail.com>
Date: Wed, 06 Mar 2024 15:22:55 +0530
Message-ID: <CAFpG3ge7UPyGMEvK3LFDsi25+JdzKch-prP+oPEdVd5afe66EQ@mail.gmail.com>
To: Ilari Liusvaara <ilariliusvaara@welho.com>
Cc: cose <cose@ietf.org>, JOSE WG <jose@ietf.org>
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Subject: Re: [COSE] [jose] Fwd: New Version Notification for draft-reddy-cose-jose-pqc-kem-00.txt
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On Wed, 6 Mar 2024 at 14:26, Ilari Liusvaara <ilariliusvaara@welho.com>
wrote:

> On Wed, Mar 06, 2024 at 11:45:03AM +0530, tirumal reddy wrote:
> > On Tue, 5 Mar 2024 at 20:12, AJITOMI Daisuke <ajitomi@gmail.com> wrote:
> >
> > > > I think we should use HPKE until there is reason not to use it.
> > >
> > > I agree.
> > >
> > > Regarding ML-KEM, I was thinking that we should add X-Wing as a PQ/T
> > > Hybrid KEM to the list of COSE-HPKE ciphersuites at first.
> > >
> > > X-Wing: general-purpose hybrid post-quantum KEM
> > > https://datatracker.ietf.org/doc/draft-connolly-cfrg-xwing-kem/
> > >
> >
> > X-wing is specific to hybrid schemes and it is back-ward compatible with
> > X25519Kyber768Draft00. The COSE and JOSE HPKE specifications can use the
> > above hybrid scheme which is already registered in HPKE IANA registry.
>
> No, that does not work.
>
> That KEM will never be published as an RFC, so the main COSE and JOSE
> HPKE specifications can not reference it. And since all the HPKE
> algorithms are fully specified, the main COSE and JOSE HPKE
> specifications can not allow using it.
>
> One would need a separate draft and use that as reference for the
> needed algorithms.
>
> X-Wing or whatever replaces it in HPKE (CFRG is just about to start the
> project on hybrid KEMs) will be published as an RFC. However, that is
> currently blocked on NIST publishing FIPS 203.
>

Sure, a separate JOSE+COSE draft can be published, and this new draft would
make reference to the outcome of CFRQ.

-Tiru


>
>
>
>
> -Ilari
>
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