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[CFRG] Re: KEM combiners design team output

Neil Madden <neil.e.madden@gmail.com> Sat, 13 July 2024 20:16 UTC

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From: Neil Madden <neil.e.madden@gmail.com>
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Date: Sat, 13 Jul 2024 21:15:55 +0100
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Subject: [CFRG] Re: KEM combiners design team output
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> On 10 Jul 2024, at 16:28, Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote:
> Hi all,
> 
> We'd like to share the outcome of the Hybrid KEM requirements design
> team.

The proposed approach seems good to me.

Regarding security properties, I am particularly interested in authenticated KEMs. Obviously most of the discussion around PQ KEMs is about IND-CCA, but almost all of my use-cases want data origin authentication. We don’t seem to have any good candidates for PQ AKEMs, but I (and I suspect others) would be quite comfortable with a KEM that provided PQ secrecy but only classical authentication. If that could be considered in the design of any generic KEM combiner, it would be great. 

I believe Signal’s PQXDH protocol operates this way: authentication is entirely classical DH-based. And Apple’s iMessage too, I believe. So I think this is an important goal to address. 

Cheers,

Neil

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