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Re: [CFRG] [EXTERNAL] Re: Streamlined NTRU Prime: sntrup761

Peter C <Peter.C@ncsc.gov.uk> Tue, 16 May 2023 09:24 UTC

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From: Peter C <Peter.C@ncsc.gov.uk>
To: Mike Ounsworth <Mike.Ounsworth@entrust.com>
CC: "cfrg@ietf.org" <cfrg@ietf.org>
Thread-Topic: [CFRG] [EXTERNAL] Re: Streamlined NTRU Prime: sntrup761
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Date: Tue, 16 May 2023 09:22:45 +0000
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Subject: Re: [CFRG] [EXTERNAL] Re: Streamlined NTRU Prime: sntrup761
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Mike,

> Thank you for the discussion; I learned something.

Thank you in return.  I found it helpful to think about the details.

> Going back to the top; the discussion was whether
> the SNTRU hybrid draft aligns with the combiner in
> draft-ounsworth-cfrg-kem-combiners, which we've
> established that it does not, and then whether it
> should -- or whether we should change the combiner
> in draft-ounsworth-cfrg-kem-combiners. I'm not sure
> how to interpret this discussion in terms of making
> progress on that question.

Are you suggesting changing draft-ounsworth-cfrg-kem-combiners so that it matches the hybrid construction in draft-josefsson-ntruprime-hybrid?  That would limit its applicability.  You couldn't use for anything that required IND-CCA security.

Changing draft-josefsson-ntruprime-hybrid is up to the author, but if it is intended to document the hybrid construction used by OpenSSH then that might not be possible.

Peter

Peter Campbell
Industry Liaison and International Standards
peter.c@ncsc.gov.uk

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