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Message-ID: <CAFMma9N4hPmebAMfSArvAxQ-93zba-brKB_M76TLpA3R0hPKOA@mail.gmail.com>
Date: Sun, 21 Aug 2011 02:05:57 -0500
From: Richard Miles <richard.k.miles@...glemail.com>
To: john-users@...ts.openwall.com
Subject: Re: John with Radeon graphical card supports?
Hi Solar
> This is unrealistic. First, John the Ripper with -jumbo supports so
> many hash and cipher types that reimplementing them e.g. in OpenCL
> would be a lot of work. So there would need to be specific demand for
> each individual hash/cipher type in order for it to be reimplemented.
> Second, a few of them are not even implementable on GPUs efficiently.
I believe it's really a huge amount of work, I just talked about it
because appears that GPU is the new toy to speed up password cracking.
I was not aware that some implementations were not efficient in GPU.
>
>> If you allow me I want to do 2 suggestions for you consider on this development:
>>
>> - If doesn't exist, add support for multiple cards on the same computer,
>
> This is definitely being considered.
Nice.
>
>> for example, someone with 2 graphical cards could have an
>> enormous benefits instead of just one.
>
> Not enormous, but at most a 2x speedup, which would translate into maybe
> a few percent of extra passwords cracked.
I'm far away to be a specialist, but I see people saying that some GPU
cards may speed up 20 times password cracking in comparison with a
normal computer CPU. So, if we use 2 GPU cards it will be the double
(40 times), not?
There is a very great article I wrote sometime ago about this:
http://erratasec.blogspot.com/2011/06/password-cracking-mining-and-gpus.html
> I am not saying we shouldn't support multiple GPUs - we definitely
> should. I am merely saying that you're over-estimating the effect.
> A mere 2x speedup (or even slightly less) does not give "enormous
> benefits" in terms of actual cracking results.
I agree with you, maybe I misunderstood the article...
>
>> - Consider add support for WPA/WPA2 handshake.
>
> Yes, this is also being considered. Specifically, we will likely have
> PBKDF2 with SHA-1 implemented on GPUs, which will be used for MSCash2
> hashes as well as for WPA/WPA2.
Awesome.
>
> Thanks for voting for these features.
>
> Alexander
>
It's a pleasure.
Thanks.
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