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Date: Wed, 26 Aug 2015 15:04:12 +0200
From: Dmitry Khovratovich <>
To: "" <>
Subject: Re: [PHC] Argon2 version 1.2.1 release

OK, I added this warning.

On Wed, Aug 26, 2015 at 2:54 PM, Solar Designer <> wrote:

> Hi Dmitry,
> That's great news.  Thank you!
> Since this version isn't necessarily "the final PHC-winner-Argon2", I
> think it's preferable that you add a statement/warning to this extent to
> the start of README.  As it currently is, people coming to the GitHub
> page might think it's the final Argon2, and they would be upset if you
> have to break compatibility later.  As JP wrote:
> On Wed, Aug 26, 2015 at 12:27:03PM +0000, Jean-Philippe Aumasson wrote:
> > Thanks! We're gonna review the changes done, and we'll discuss on how to
> > move from this version to the final PHC-winner-Argon2.
> As to GPU implementations, we only have some minor news:
> - Some of the GPU performance figures for the original Argon2 have been
> improved slightly since my last posting.
> - Exploiting the original Argon2's 8-way BLAKE2b parallelism on GPUs
> turned out to be non-trivial because of the SIMT vs. SIMD aspect.
> Unfortunately (for the original Argon2's security), this may be more of
> an implementation difficulty than a fundamental limitation of GPUs.
> We might give some non-trivial approaches a try, but this isn't going to
> be as simple as programming with vector types in OpenCL (those vectors,
> so to speak, get rotated 90 degrees against our desired placement).
> - We should be able to test the existing OpenCL kernels on Titan X soon.
> Thanks again,
> Alexander

Best regards,
Dmitry Khovratovich

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