Date: Mon, 17 Jun 2013 08:19:01 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Mask mode for GPU Sayantan, On Mon, Jun 17, 2013 at 09:19:14AM +0530, Sayantan Datta wrote: > Generating password for each work item on host and repeating aa to zz in > each work item doesn't works very good with descrypt. There is a lot of > performance loss(30-40%) due to looping inside the kernel. But I think > this works great with md5 and other fast hashes(haven't tested myself > though). I don't see why it would result in extra overhead for descrypt (and compared to what). Can you explain this in some detail, perhaps with examples? > So for descrypt I think we should generate one key on the host > and generate the remaining on GPU with each work item generating a > different set of password. I don't see how what you wrote here is different from the approach I had proposed. You're talking about generating a set of passwords (not just one password) per work-item anyway. > One key issue with this is fitting the mask with GWS. I had thought of this, and it's one of the reasons why I suggested the approach I did suggest. It lets us keep the portion of mask to search on GPU independent from GWS. Alexander
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