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Date: Wed, 28 Mar 2012 09:02:44 +0200
From: Simon Marechal <>
Subject: Re: Working on DES format on CUDA

On 27/03/2012 10:52, Solar Designer wrote:
>> I think I will implement original DES algorithm first. Does that okay?
> That's up to you.  There are JtR formats that build upon the original
> DES as well (without the E table modification).
> To understand bitslicing, you'll need to read Eli Biham's paper.

Just a note : I know hashcat author, Atom, tried a bitsliced DES
version, but reported that the register usage was too high to make it
competitive with the "vanilla" version. I thought this was surprising
but he is probably the most experienced GPU-cracker writer around. This
means it is probably non trivial.

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