john-users - Re: working with large files

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Date: Sat, 26 Apr 2008 09:07:22 +0200
From: Simon Marechal <simon@...quise.net>
To: john-users@...ts.openwall.com
Subject: Re: working with large files

I'm often working with 500k/1M saltless passwords. An usual task is to
run john on LM hashes for a few minutes to prune the file before doing
the whole rainbowcrack stuff.

Solar Designer wrote:
> once.  I will likely deal with that by introducing two additional hash
> table sizes - with 64 Ki and 1 Mi entries - or maybe by introducing
> arbitrary-size hash tables (although the hash functions for those would
> be slower).

Here, for a 1M pwd file the 64K entries hash table is 5 times faster
than the standard one (when few passwords are found). This is definitely
useful.

> negligible for sessions that run for weeks or months.  In practice, all

My issue here is that I do not want to run john for mouths before
running rainbowcrack on the hard hashes. I want to spend a few minutes
to remove the low hanging fruits.

> This is what I meant by "updating the existing per-salt hash table"
> above.  There should be no side-effects if you do it right (and if the
> hardware is not faulty).  Also, don't forget to update the "count".

I will try to do that properly next week.

Simon

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