phc-discussions - Re: [PHC] Argon2 improvement thread

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Message-ID: <20150723010333.GA1923@openwall.com>
Date: Thu, 23 Jul 2015 03:03:33 +0200
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Argon2 improvement thread

On Tue, Jul 21, 2015 at 09:45:18PM +0200, Solar Designer wrote:
> On Tue, Jul 21, 2015 at 12:24:00PM -0700, Bill Cox wrote:
> > If Alexander proposed to integrate his PWXFORM (I don't know what MAXFORM
> > is), then I would be for it.  This would satisfy my request for improved
> > GPU resistance, and also my request for multiplication-chain computation
> > time hardening.
> 
> MAXFORM is the scalar equivalent to (and subset of) pwxform.  It's
> neither parallel, nor wide, but is otherwise the same.

As to why I call it MAXFORM:

1. MAX stands for multiply-add-XOR (much like ARX is add-rotate-XOR).

2. MAX doubles as referring to the latency of one round being
max(multiply, lookup).

3. XFORM is short for transformation.

Alexander