Re: [openpgp] First 4880bis drafts

Aaron Zauner <azet@azet.org> Thu, 05 November 2015 18:19 UTC

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Date: Thu, 05 Nov 2015 19:19:07 +0100
From: Aaron Zauner <azet@azet.org>
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To: "brian m. carlson" <sandals@crustytoothpaste.net>
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Cc: Werner Koch <wk@gnupg.org>, openpgp@ietf.org
Subject: Re: [openpgp] First 4880bis drafts
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brian m. carlson wrote:
> As Werner pointed out, Camellia has been around for some time.  It's
> also good to have enough diversity that if someone comes out with a
> major attack against AES, we're not totally sunk.  Camellia is a Feistel
> cipher, while AES is a substitution-permutation network, which means
> that attacks are unlikely to work against both.

Ok - so what's the threat model here? Are we really expecting AES to be
broken anytime soon? Really? And we're suggesting to keep ciphers around
that have seen far less cryptanalysis?

...

> I believe Google's End-to-End is using the NIST curves, and there are
> already keys using these curves.  I think Curve25519 and Goldilocks
> would be valuable due to their rigidity and the CFRG endorsement.

Wasn't aware that end2end already has a userbase (after all, for a very
long time the GitHub repo stated 'experimental code - do not use').
Likewise Curve25519 is available in GnuPG expert mode (it says use is
discouraged though - and keyservers won't accept it).

Aaron