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Date: Tue, 11 Apr 2006 11:40:44 +0000
From: "jay rubin" <>
Subject: FW: help me understand password cracking

Sorry for resending this.  My hotmail account was locked down since last 
Thursday because three people requested that they not get email from my 
address.  Evidently this is what hotmail does when they get requests like 
that.  Anyway if you had sent a response I didn't get it.

>Subject: [john-users] help me understand password cracking
>Date: Sat, 08 Apr 2006 15:42:18 +0000
>Solar Designer-
>Could you help me understand exactly what it is that john does.
>In the README for pwpump2 it has the statement:
>This is an application which dumps the password hashes (OWFs) from NT's SAM 
>database, whether or not SYSKEY is enabled on the system.
>Okay OWF is one way function.  I really get the feeling that pwpump has 
>dumped from the SAM database the result of the password after it has passed 
>through the hashing algorithm.  Or has it dumped the algorithm that was 
>used to create the encrypted password?  This second option doesn't make 
>sense because than what would jtr be comparing to it's results.
>Now what does jtr do to decrypt the password?  Does john know the hashing 
>algorithm and just pass every canidate password combination through the 
>hashing algorithm until it gets one that matches the dump from pwdump2? Or 
>Thanks again you've been a wonderful help to me.
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