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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