Using CPUs instead of GPUs doesn't make any sense at all, CPUs are a _lot_ slower than GPUs for these kinds of computations and you would need a cluster (i.e much more expensive) to be able to get similar performance.
To really crush both CPUs and GPUs, you could create an ASIC for it instead. I bet that there are A5/1 cracking ASICs out there already, just not in the hands of the public AFAIK. Using FPGAs would be a decent middle ground. Cheers, Joel On Wed, Mar 26, 2014 at 2:22 PM, Nikos Balkanas <[email protected]> wrote: > > > > On Wed, Mar 26, 2014 at 1:51 PM, Joel Eriksson <[email protected]>wrote: > >> It will be _a lot_ slower. If you want to have any chance of intercepting >> frequency hopping calls (without having receivers constantly recording >> everything at each of the possible frequencies) you need to use GPUs and >> SSDs. If you don't have to deal with frequency hopping, and don't have to >> decipher in near real-time, it doesn't matter as much. >> >> Regards, >> Joel >> >> > In such case, wouldn't it make more sense to have more CPUs on the MB? > > >> On Wed, Mar 26, 2014 at 11:36 AM, Nikos Balkanas <[email protected]>wrote: >> >>> >>> >>> >>> On Wed, Mar 26, 2014 at 8:40 AM, Amber and Sarosh < >>> [email protected]> wrote: >>> >>>> Hi All, >>>> Can anyone please guide if GPUs are necessary for rainbow table lookup >>>> using kraken to find the key to decipher an intercepted communication or is >>>> it possible to do this using just CPUs? In case the later is possible how >>>> much time it will take approximately? >>>> >>>> >>> GPUs are not necessary, just desirable. If GPUs are missing, kraken will >>> still work with A5Cpu.so, but it will be somewhat slower. Assuming that >>> during cracking your PC is CPU limited, the benefit should scale roughly >>> with your setup ratio of GPU power/CPU power. In reality you will run into >>> RAM and table I/O bottlenecks before that. In short it is highly depended >>> on your setup ;-) >>> >>> The idea is, that the easier factor to improve is the CPU, so why not do >>> it? >>> >>> Nikos >>> >>>> Regards, >>>> Naheed, Amber & Sarosh >>>> >>>> _______________________________________________ >>>> A51 mailing list >>>> [email protected] >>>> https://lists.srlabs.de/cgi-bin/mailman/listinfo/a51 >>>> >>>> >>> >>> _______________________________________________ >>> A51 mailing list >>> [email protected] >>> https://lists.srlabs.de/cgi-bin/mailman/listinfo/a51 >>> >>> >> >> >> -- >> Best Regards, >> Joel Eriksson >> > > -- Best Regards, Joel Eriksson
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