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Message-ID: <20130113014047.GA10164@openwall.com>
Date: Sun, 13 Jan 2013 05:40:47 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Cracking md5 salted password
On Sun, Jan 13, 2013 at 05:29:08AM +0400, Solar Designer wrote:
> On Sat, Jan 12, 2013 at 11:37:54PM +0000, fevere alleee wrote:
> > Loaded 1 password hash (FreeBSD MD5 [128/128 SSE2 intrinsics 12x])
> [...]
> > guesses: 0 time: 7:18:20:36 0.00% (3) c/s: 87711 trying: lg976r17 -
> > lg976rk7
>
> OK, this is sane speed for a quad-core CPU. It's just about 15% slower
> than what I'd expect for a Q6600, but maybe there was some other load.
Oh, I think I figured it out. You didn't answer my question on what
make target you used, but I am guessing it is linux-x86-64. If so, you
may obtain some speedup by using linux-x86-64i (with the trailing "i")
instead. Also try:
export GOMP_SPINCOUNT=3000000
before running "john". You may adjust the value (e.g., try 30000,
100000, 300000, 1000000, 3000000) until you get stable good speeds with:
./john --test --format=md5
(running it a few times in a row each time).
The expected speed is about 105k c/s.
Not that this makes much of a difference in your case. You primarily
need to run different attacks, such as with other wordlists and rules.
You may save the .rec file from your original run, though - so that you
can continue it later. e.g.:
mv john.rec first.rec # now
./john --restore=first # maybe later
Alexander
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