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Date: Wed, 19 Aug 2015 18:37:03 +0300
From: Solar Designer <>
Subject: Re: PHC: Argon2 on GPU

On Wed, Aug 19, 2015 at 07:10:42AM +0300, Solar Designer wrote:
> For Argon2i, you should be able to easily optimize this overhead out,
> since all the indices are known in advance (they are the same each
> time, by design, as required to avoid cache timing leaks).  You should
> also be able to optimize out the hashing that produces those indices
> (before the modulo division), but that's relatively minor (yet by all
> means make this optimization as well if you do precompute the indices).
> This means you will need some memory to store those indices in (1536 of
> them for our current benchmarks? meaning something like 3 KB?), but this
> memory can be shared between different concurrent hash computations.

Well, not 1536, but 3 times that, for t=3.  Still easily affordable.


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