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Date: Thu, 24 Jan 2008 20:12:27 +0300
From: Solar Designer <>
Subject: Re:  question about charsets

On Thu, Jan 24, 2008 at 04:48:50PM +0000, helleye wrote:
> does it use 2 last or 3 last ?

It uses two characters to decide on the third one.

> is it a good idea to use 3 last as improvment if it use 2 atm ?

Maybe - but not necessarily.  This would need too much memory at the
time I initially implemented this stuff (1998), but memory has gotten
much cheaper since then.  So 400+ MB for length 8 should be OK these
days. :-)

Of course, it is critical that you add a fallback from 3 to 2 when
there's no information for 3.

The reason why this might not work too well is that, with this change,
JtR might be better "memorizing" specific passwords rather than
"learning" what typical passwords look like.  But you can give it a try.

Alexander Peslyak <solar at>
GPG key ID: 5B341F15  fp: B3FB 63F4 D7A3 BCCC 6F6E  FC55 A2FC 027C 5B34 1F15 - bringing security into open computing environments

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