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Date: Fri, 28 Aug 2015 09:52:45 -0700
From: Bill Cox <>
To: "" <>
Subject: Re: [PHC] Flaw in Argon2 TMTO ASIC analysis

On Fri, Aug 28, 2015 at 6:48 AM, Dmitry Khovratovich <
> wrote:

> If the ASIC running time is about the same as for CPU (which is reasonable
> to expect), then the bandwidth would be about 20-50 GB/sec, so it can grow
> by the factor 4-8 without affecting running time.
> This is the main reason I want to use the new MAXFORM feature in Argon2.
Without MAXFORM, I estimate an attacker can make use of 320 GiB/s of
bandwidth without being computation speed limited.  With MAXFORM, I
estimate he can make use of only 40 GiB/s before hitting the computation
speed wall.

That 8x free parallelism in Argon2's compression function is my least
favorite thing about Argon2.  MAXFORM fixes it, while providing GPU
resistance and more.


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