phc-discussions - yescrypt to gain Catena features (Re: [PHC] gambit wiki strength)

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Message-ID: <20140414205510.GA30918@openwall.com>
Date: Tue, 15 Apr 2014 00:55:10 +0400
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: yescrypt to gain Catena features (Re: [PHC] gambit wiki strength)

On Mon, Apr 14, 2014 at 03:09:19PM -0400, Bill Cox wrote:
> Yescript: The is surprisingly little in the Yescript code that seems
> inspired by Catena.  I think Alexander is a fan of client-independent
> update, but I don't see support for it in the code.  Perhaps Solar Designer
> feels worse about using other people's good ideas than me.  He does have
> server-relief, but it's an extended version meant to be nearly compatible
> with SCRAM.

I can add cost upgrades (client-independent updates in Catena terms)
without breaking compatibility with yescrypt's current hashes.  I intend
to add this maybe in the tweaks period.

I also intend to add cache-timing resistant mode(s).

The reason these things aren't in there yet is that I focused on core
functionality first, whereas I view these as nice extras.  I simply
didn't have time for these extras without impacting my work on the core.
I also feel that yescrypt is complicated as it is, so having even more
functionality in there might be counter-productive for initial reviews.

I have no problem using other people's good ideas, with due credit and
as long as the ideas aren't patented - e.g., yescrypt builds upon scrypt,
and a future version will likely optionally use Catena's bit reversal.

Alexander