Date: Tue, 25 Dec 2012 00:45:35 +0530 From: Sayantan Datta <std2048@...il.com> To: john-dev@...ts.openwall.com Subject: Re: bitslice DES on GPU On Sun, Dec 23, 2012 at 3:39 PM, Sayantan Datta <std2048@...il.com> wrote: > Hi Alexander, > > I'm now able to pinpoint the locations of 2 out of 48 indexes in the > binary. And modifying them at those locations really works( at least on > 7970) !! > > Regards, > Sayantan > > > Although I have located all the 48 indexes in the binary, but modifying them works only for a few salts. The problem is the offset values are drifting with different salts and I can't generalize the whole process for all of them. Of course we can find the offset values individually for all the salts but it would be a task of astronomical proportions!! Maybe we should think of some other techniques rather than modifying the binaries. For example , we can pre-compile all the 4096 kernels save them on disk and load them before we start cracking/benchmark. While pre compiling we could also use multiple cores to reduce the time required. Disk space required is less than 600MB and time required should be less than 10min for a quad core. This would be more general, reliable and require far less maintenance. Regards, Sayantan Content of type "text/html" skipped
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