On Mon, Mar 16, 2026 at 03:41:59PM +0000, Salz, Rich wrote:
> > I also could see folks trying to avoid the HRR
> > altogether and rip the X25519 out of the hybrid key
> > share  and use immediately.  That's not a "reuse", I
> > suppose, but still seems a bad idea.
> 
> Can you say why?  My inclination would be to codify it and say that
> any hybrid keyshare could be used for its constituent parts unless the
> definition of the hybrid says otherwise.

Hybrid proponents are adamantly against treating the hybrids as
non-atomic.  I suspect it comes down to their security proofs/arguments
resting on treating them as atomic.

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