Re: tls: Hybrid key exchange of ECC and Post-Quantum

Kazu Yamamoto (山本和彦) via Haskell-Cafe <[email protected]> Fri, 27 Feb 2026 08:42:58 +0900 (JST)
Newsgroups gmane.comp.lang.haskell.cafe
Message-ID <[email protected]>
Hello Viktor,

> I'm very curious what you mean when you say "the OpenSSL
> specifying-method"..

The version of "openssl s_client" which I tried is 3.6. It specifies
the followings in ClientHello in order.

	X25519MLKEM768, X25519

I guess this implements:

- Hybrid algo is preferred to ECC algo.
- Minimal data volume. (If a server does not handle two, HRR is used.)

> You have my Google Chat contact, please reach out.

I will continue to dicsuss this in the github issue because I'm busy
today. Probably, I can find time on Monday.

--Kazu


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