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Date: Sun, 26 Apr 2015 00:33:42 +0300
From: Solar Designer <>
Subject: Re: [GSoC] John the Ripper support for PHC finalists

On Sun, Apr 26, 2015 at 12:31:49AM +0300, Solar Designer wrote:
> On Sat, Apr 25, 2015 at 10:28:31PM +0200, Agnieszka Bielec wrote:
> > 2015-04-25 21:20 GMT+02:00 Solar Designer <>:
> > > "4 GPU units" sounded weird and confusing to me.
> > > If you put a hash of a known password in a text file, and put the
> > > password somewhere down a wordlist, and run "john" with pomelo-opencl
> > > against that, will it crack the hash?
> > 
> > It works
> Can you explain how/why it works?  I am probably missing something.
> I would expect it to fail most of the time.

Oh, maybe it happens to work precisely because those 4 work-items tend
to be part of the same SIMD vector in hardware, so with current OpenCL
drivers they happen to be "guaranteed" to be ready at the same time?


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