john-users - Fwd: Filter for partially known passwords.

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Date: Mon, 23 Jan 2012 11:53:37 +0100
From: Martin MÃ¥nsson <martin.mansson@...com>
To: john-users@...ts.openwall.com
Subject: Fwd: Filter for partially known passwords.

I figured it out thanks to this post.

http://www.openwall.com/lists/john-users/2008/05/20/2

Martin

Begin forwarded message:

> From: Martin Månsson <martin.mansson@...com>
> Subject: Filter for partially known passwords.
> Date: 23 januari 2012 10:15:24 CET
> To: john-users@...ts.openwall.com
> 
> Hi folks,
> 
> I have created a simple filter function that adds a partially known password to word[] to use with any of the modes.
> 
> Let's say the password is 6 characters and i happen to know that the first 2 chars are 'A' and 'B'. The filter will initialize
> 
> word[0] = 'A'; 
> word[1] = 'B';
> 
> Now i want to use this filter with, lets say, the incremental mode. Setting MinLen = 4 and MaxLen = 4.
> 
> The question (might be a dumb one) how can i tell john to start processing the word from position word[2] and not word[0] ? Is there a pre-defined external variable for the position in the word ?
> 
> Thanks,
> 
> Martin