Re: [Cfrg] SIV for non-AES ciphers first draft

Tony Arcieri <> Tue, 22 January 2019 21:09 UTC

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From: Tony Arcieri <>
Date: Tue, 22 Jan 2019 13:09:20 -0800
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Subject: Re: [Cfrg] SIV for non-AES ciphers first draft
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Perhaps I should add: specifically what I would like to see is a
generalized framework for SIV modes and some new instantiations of that
framework, and perhaps one which looks a little more like
draft-irtf-cfrg-gcmsiv than what is presently in this draft (which looks a
lot more like RFC 5297) .

More concretely I'm thinking of a framework which could describe both
AES-GCM-SIV and a new concrete instantiation using (X)ChaCha20. Since
AES-GCM-SIV is already designed to work with a universal hash function, I
think such a construction could potentially be paired with Poly1305, which
seems like a more natural pairing to me.

Though I didn't opine on this thread, I wrote a bit more of a long-form
response to this draft here:

This is all to say: I like the spirit of this draft, but I can see why
people might be a bit off-put by the particular details of the current

Tony Arcieri