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Message-ID: <20100923195604.GA18037@openwall.com>
Date: Thu, 23 Sep 2010 23:56:04 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Trying to port user accounts to a web site
On Thu, Sep 23, 2010 at 11:51:57AM -0700, Scott Hamilton wrote:
> 6. Here's a sample that I used:
>
> user1@...plepc.com:Pz8/Excycz8YMWY1P0U6P0A/egJKPz8/BW5mP3gPXT8PfhVhdz8mPzM/Pz8/CmoX
>
>
> user2@...il.com:D2o/Pz96Tj8/Pz90Aw13Dm0/ST8/CSM/Pz9lOz9nPz8/Pyo/cz9iaDQ/Nz91PD8F
>
> user3@...oo.com:PyA/eRpdPzYNEgtPP2NzAT8zPyE/PxQgPxA/Pz8/Pz8ZPz8/ID93PxxyPz8/Pz8/
This is definitely not supported by JtR, and in fact it _might_ be
reversible obfuscation and not hashing. Some observations:
- 64-character strings;
- 16 blocks of 4 characters each;
- "Pz8/" is common;
- "/" is common at the end of a 4-char block;
- "P" is common at the beginning of a 4-char block.
It is likely possible to figure the algorithm out given some samples of
plaintext and obfuscated passwords. The approach to use would be to set
different yet similar plaintext passwords (on one's own accounts) and
observe how the corresponding obfuscated string changes.
This has nothing to do with JtR, though, so further discussion on this
list would be inappropriate.
Alexander
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