Usama,

> In my understanding, at least 21 member states of the EU need hybrids.

Interesting.  As part of some CRA-related work, I'd been trying to compile a 
list of national-level requirements for PQ migration so that I could compare 
them to the EU-wide roadmap.  Do you have a reference for this?  Or even just a 
list of which 21 have their own requirements?

Thanks,

Peter

From: Muhammad Usama Sardar <[email protected]>
Sent: 30 April 2026 09:33
To: Stephen Farrell <[email protected]>; [email protected]
Subject: [TLS] Re: anyone interested in multiple CertificateVerify messages?


Hi Stephen,
On 30.04.26 01:25, Stephen Farrell wrote:
I wonder if anyone has explored
whether it'd be useful to look at defining a way in which a
server (or, I guess, a client) could authenticate using more
than one CertificateVerify message?

Yes, please see Sec. 9.1.2 of [0]. The detailed design and formal analysis of 
this is in a paper that we submit next week. Happy to share that off-list if 
you are interested.

As Ekr pointed out, [1] is a good start. I believe authors have done good work. 
If you (and others) find out that it is potentially useful direction, please 
attest to it in the thread [2] to move this work forward.
In my understanding, at least 21 member states of the EU need hybrids. We have 
to do something for them. So I read "way too complicated" mentioned in the 
thread as "let's get started with some serious work rather than doing hacks 
like standalone ML-DSA."

Thank you.

Sincerely,

-Usama



[0] 
https://www.researchgate.net/publication/398839141_Identity_Crisis_in_Confidential_Computing_Formal_Analysis_of_Attested_TLS

[1] https://datatracker.ietf.org/doc/draft-yusef-tls-pqt-dual-certs/

[2] https://mailarchive.ietf.org/arch/msg/tls/ZRuadgaS5z_LM25YSA6qIOF2VbU/
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