What are the implications for environments that require NIST Sec Level 3 or 5?

Regards,
Uri

> On Jul 26, 2022, at 11:33, Martin Thomson <[email protected]> wrote:
> 
> On Tue, Jul 26, 2022, at 11:21, Stephen Farrell wrote:
>> Be interested in how that'd change the CH if ECH is used too.
>> I guess the answer mightn't make us happy;-)
> 
> PQ HPKE would not fit, but the Kyber-512 numbers mean that we should be OK 
> for ECH if we stuck with classical security.  For obvious reasons, that might 
> not be OK though.
> 
> If we wanted a PQ HPKE (or a Hybrid KEM) then ECH would blow out the size so 
> that we would end up with multiple packets for the CH.  That would be 
> basically unworkable from a performance perspective.
> 
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