Date: Wed, 19 Aug 2015 18:37:03 +0300 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com 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. Alexander
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