Date: Fri, 25 May 2012 01:59:43 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: OpenCL crypt-sha512 (was: john-users: Can Excessive Rounds make Password cracking Infeasable) On 05/25/2012 12:25 AM, magnum wrote: > On 05/24/2012 11:03 PM, Solar Designer wrote: >> On Thu, May 24, 2012 at 10:49:41PM +0200, magnum wrote: >>> FWIW, some very quick tests on Solar's test gear with the hash above: >>> >>> CPU (8 cores): 4.75 c/s >>> GTX580: 4300 c/s >>> HD7970: 6000 c/s >>> >> These GPU speeds are not realistic. There must be a bug or just lack of >> support for non-default numbers of iterations for this hash type (this >> is something for us to correct if so!) Claudio, Your format has some problems with cracking real hashes, even though it passes self-tests. Here's a way to make any number of test hashes: $ for i in `../run/john -inc -stdout | head -10000 | shuf | head -20`; do echo $i | mkpasswd -m sha-512 -P 0 ; done > testhashes All should be cracked quickly using incremental mode. You can also add -R <rounds> to mkpasswd, but the problem is not really with rounds but with salts (it seems). You can set a fixed salt with -S, I tried attacking only one or a few salts and 100% was cracked. magnum
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