Date: Wed, 28 Mar 2012 09:02:44 +0200 From: Simon Marechal <simon@...quise.net> To: john-dev@...ts.openwall.com 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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