Date: Sun, 19 Oct 2014 15:13:14 +0300 From: Milen Rangelov <gat3way@...il.com> To: john-users@...ts.openwall.com Subject: Re: Re: PKZIP and GPU acceleration Hello, > For this format, GPUs don't matter. (We do have a GPU-enabled format > for the newer WinZip/AES archives, but not for the old PKZIP.) I do not completely agree, but it depends on the number of files in the zip archive. If you have a single file, then yes - it does not matter. If you have at least several files, then you get additional verifiers and then you can do most of the work on the GPUs leaving decryption/decompression/CRC check on the CPU for just a very small subset of the password candidates. A zip archive with 4-5 files in it can greatly benefit from GPU processing, I remember speeds exceeding 1B/s on a 7970. But I also remember being asked a lot of times why cracking old zip format is much slower than what I've tweeted a while ago and I have to explain the same thing over and over again. On Sat, Oct 18, 2014 at 7:19 PM, Federico <feedtek@...il.com> wrote: > Greetings from italy > > Right now i'm trying to decrypt a pkzip hash on a c3.8xlarge > This is a 1.7.9 jumbo with openmp: > > Benchmarking: PKZIP [32/64]... (32xOMP) DONE > Many salts: 148070K c/s real, 4630K c/s virtual > Only one salt: 34508K c/s real, 1078K c/s virtual > > At work: > guesses: 0 time: 0:00:02:32 0.00% (3) c/s: 28193K trying: 29vgwbip - > 29v336s0 > > How about this? Sounds good? > > On the official 1.8.0 i cant decrypt pkzip hashes (havent tryed a test > with fork=32) > >
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