Bas Westerbaan writes:
> From a security standpoint, I see little value in using SLH-DSA over
> (hybrid) ML-DSA unless you also use a different key agreement.

Sorry, can you please clarify the rationale here?

I agree that the security of TLS collapses unless the KEM _and_ the
signature system are both secure. In particular, TLS using ML-KEM and
SLH-DSA needs both ML-KEM and SLH-DSA to be secure; TLS using ML-KEM and
ML-DSA needs both ML-KEM and ML-DSA to be secure.

But how are you concluding that TLS using ML-KEM and SLH-DSA has risk as
high as TLS using ML-KEM and ML-DSA?

---D. J. Bernstein

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