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Date: Wed, 13 Feb 2013 20:25:37 +0400
From: Solar Designer <>
Subject: Re: RAR Cracking with JtR Jumbo (Files found during forensics)

On Wed, Feb 13, 2013 at 03:46:19PM +0000, Nicolas Brulez wrote:
> I have a stupid question, how to enable GPU on windows with JtR?

Not a stupid question.  The answer is we don't support GPUs under
Windows yet.  We do under Linux and Mac OS X.

> I am not sure yet. Not a single clue of how the distribution is done on JtR.
> I have several machines, maybe i could try it at home. I also received an offer, I suppose i could use my computers
> as well as people willing to help at the same time ?

Yes, but it's a bit tricky.

> This is what i got from rar2john:

Thanks!  What version of John?  Looks like not our latest git?

> $rar3$*0*deaac5fe718c2eb0*ca36e398cc9ea2c54cfd92d378a84fe7
> $rar3$*0*97c9bc9cbc1e00ac*92d09807b3932d3d9ad4fbb80a06c29e
> $rar3$*0*7d1ac6125f295a5a*c48559081a762e1a6db410e21e786881

After changing s/rar/RAR/ I got these loaded with bleeding-jumbo.
Actual speeds I am getting for these are:

HD 7970: 861 c/s
GTX 570 o/c: 1219 c/s

I'm not sure why 7970's speed has dropped so much (vs. --test).  magnum?

To do something useful, I actually ran the 7970 against password.lst
--rules=jumbo (3% done now) and the GTX 570 against RockYou top 10k
--rules=jumbo (1% done now), both with duplicates purged and running
against the first of three RARs only (I guess the password is the same
for the three).  I'll probably interrupt these at some point before
completion, though, as we use this box for JtR development and


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