On Wed, Mar 26, 2014 at 5:12 PM, Joel Eriksson <joel.eriks...@gmail.com>wrote:
> 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. > > You don't need a cluster for a multiprocessing board. Just a multiprocessing kernel that linux provides. Radeon's GPUs are, to my knowledge, AMD CPUs, but at lower frequencies. Granted, you don't have a general kernel running on top of them, but an MP kernel has load balancing and preemptive multitasking that kraken hasn't. ;-) But we are in agreement here. If you have a GPU sitting idle, why not take advantage of it? 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. > Yeap. > > Cheers, > Joel > > > On Wed, Mar 26, 2014 at 2:22 PM, Nikos Balkanas <nbalka...@gmail.com>wrote: > >> >> >> >> On Wed, Mar 26, 2014 at 1:51 PM, Joel Eriksson >> <joel.eriks...@gmail.com>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 <nbalka...@gmail.com>wrote: >>> >>>> >>>> >>>> >>>> On Wed, Mar 26, 2014 at 8:40 AM, Amber and Sarosh < >>>> amber_sar...@hotmail.com> 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 >>>>> A51@lists.srlabs.de >>>>> https://lists.srlabs.de/cgi-bin/mailman/listinfo/a51 >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> A51 mailing list >>>> A51@lists.srlabs.de >>>> https://lists.srlabs.de/cgi-bin/mailman/listinfo/a51 >>>> >>>> >>> >>> >>> -- >>> Best Regards, >>> Joel Eriksson >>> >> >> > > > -- > Best Regards, > Joel Eriksson >
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