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Date: Tue, 5 May 2015 21:53:17 +0200 (CEST)
Subject: Re: [PHC] Argon2

On Tue, 5 May 2015, Solar Designer wrote:

> Does this mean you'd like us not to accept even the Argon2 tweaks that
> the Argon team has just promised will be ready by the end of this month?

If the panel accepts the Argon2 tweaks, it should give the other finalists 
a decent amount of time to propose tweaks as well. Everything else would 
be extremely unfair.

I wouldn't mind that. But the consequence is clear: This would delay the 
process by a couple of months. Just waiting to the end of this mongth 
won't do.

> Does use of BlaMka in Argon2i count as an optimization rather than a tweak?

That sounds like an optimisation to me.

BTW, Catena has very specifically been defined as a framework. You are 
invited to plug in the hash function you like -- including SHA-512, 
BlaMka, and whatever. (The default instantiation is based on Blake2b, but 
that is just one of many allowed instantiations.)

> What about a change in block indexing during memory filling?

This is something I would consider a tweak, not an optimization any more.

So long


------  I  love  the  taste  of  Cryptanalysis  in  the morning!  ------
--Stefan.Lucks (at), Bauhaus-Universit├Ąt Weimar, Germany--

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