phc-discussions - Re: [PHC] Deliberately GPU-friendly password hashes?

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Message-ID: <2067546566.1002341.1396500583314.open-xchange@email.1and1.com>
Date: Wed, 2 Apr 2014 23:49:43 -0500 (CDT)
From: Steve Thomas <steve@...tu.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Deliberately GPU-friendly password hashes?

> On April 2, 2014 at 11:38 PM Daniel Franke <dfoxfranke@...il.com> wrote:
>
> I think I've at least glanced at all 24 entries now and it doesn't look
> like there are any which are intended to be friendly to defensive GPU
> use. I think this is an unfortunate omission.

Parallel it's SIMD, GPU, FPGA, and ASIC friendly. It's not memory-hard,
but as a defender you can use whatever hardware the attacker is using.
Well besides maybe ASICs but it depends on how interface to them is. If
it's a simple send password and salt or initial key and get a hash back
then yes, but if it's a here's the salt and hash now let me send you a
bunch of passwords to test and ask if one of the last N passwords match
then it won't work.