Date: Thu, 18 Aug 2011 23:37:06 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: John with Radeon graphical card supports? On Thu, Aug 18, 2011 at 10:06:03AM -0500, Richard Miles wrote: > You guys really do a great job, congratulations. I see this as very > promising area, at the moment the graphical cards are still a bit > expensive to me. Maybe during next months they get cheaper and also > the support get all algorithms that we have today for normal john, for > sure this will be a great point on the history of John The Ripper. 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. > 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. > 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 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. > - 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. Thanks for voting for these features. Alexander
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