[A51] Query - Use of Kraken with CPUs

Omar Arana ojarana at gmail.com
Wed Mar 26 17:57:02 CET 2014


Any  know the best compatible gpu board to manage decrypt signals? Unknow
if firepro 8xxx series is ok or have a best performance card?
El 26/03/2014 10:39, "Nikos Balkanas" <nbalkanas at gmail.com> escribió:

>
>
>
> On Wed, Mar 26, 2014 at 5:12 PM, Joel Eriksson <joel.eriksson at 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 <nbalkanas at gmail.com>wrote:
>>
>>>
>>>
>>>
>>> On Wed, Mar 26, 2014 at 1:51 PM, Joel Eriksson <joel.eriksson at 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 <nbalkanas at gmail.com>wrote:
>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Mar 26, 2014 at 8:40 AM, Amber and Sarosh <
>>>>> amber_sarosh at 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 at lists.srlabs.de
>>>>>> https://lists.srlabs.de/cgi-bin/mailman/listinfo/a51
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> A51 mailing list
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Best Regards,
>>>>   Joel Eriksson
>>>>
>>>
>>>
>>
>>
>> --
>> Best Regards,
>>   Joel Eriksson
>>
>
>
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