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Date: Wed, 1 Sep 2010 16:36:17 -0500
From: "Joshua J. Drake" <jtr-users@...p.org>
To: john-users@...ts.openwall.com
Subject: Re: Fw: Noob question: how to feed 10 alphanum char min&max incremental to aircrack when "MaxLen = 10 exceeds the compile-time limit of 8"

On Wed, Sep 01, 2010 at 09:18:07PM +0000, Mr Ex wrote:
> Thanks for the reply.
> 
> It does need to be 10 alnum as the passphrase won't just be digits (and I'd be 
> using Mac OSX). So its not possible to just do 10-10 alphanum chars on JtR as 
> far as anyone knows? Given that I don't want 9, 8, 7 or less alnum chars nor 11+ 
> alnum chars *just 10*, seems quite a reasonable, not too overly time-consuming 
> crack to want to feed through from John, I'd be surprised if its not possible.
> 
> I take what you're saying in terms of generating a custom .chr file and have 
> re-read http://www.openwall.com/john/doc/EXAMPLES.shtml but isn't that method 
> merely a way of filtering, i.e. it won't actually make John do a min 10 / max 
> 10, or am I just not understanding it right?

No offense to Solar or any other john contributors, but you might be
better off implementing your own generator program. It won't exactly
be elegant, but it will likely do the job (exhaustive brute force). Be
sure to periodically save state then you can recover in the case of
failure. 

Another option might be to use the markov model work done with john.
It may help you guess quicker.

Good luck,

-- 
Joshua J. Drake

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