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Message-ID: <20120412175427.GA22033@openwall.com>
Date: Thu, 12 Apr 2012 21:54:27 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: JTR against 135 millions MD5 hashes
On Thu, Apr 12, 2012 at 07:40:20PM +0200, websiteaccess@...il.com wrote:
> I'm trying my own text dictionary (6 gigas) against 135 millions (4,6 gigas) hash file.
Is this part of KoreLogic's torrent with lots of hashes? (I haven't
looked at it yet.)
> After 20 minutes, JTR begin to crack MD5, but it very very slow, in fact JTR seems frozen, I can hear the hard drive running and running.
How much RAM do you have?
How much does the "john" process occupy?
What version of JtR is that?
> JTR display also -> "excessive partial hash collisions detected"
Thanks for the info. We'll need to check whether this is supposed to
happen with that number of hashes or not.
> If I try the same process with only 200 megas hashes files (4.6 splitted in 200 megas parts), this time JTR crack tons of MD5 after 2 or 3 minutes.
>
> Is JTR able to crack 1 file with 135 millions MD5 hashes ?
It should be, but you may need more RAM. Alternatively, try the
--save-memory=2 option or/and split the file into a few chunks (e.g.,
maybe halves of that large file will fit in your RAM one at a time).
Alexander
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