From: Art Cooper (acooper@pop.innerwall.com)
Date: Wed Apr 26 2006 - 16:57:05 EDT
The ONLY good way to do these is with Cain & Abel and a HUGE rainbow dictionar
(ies)
Best Regards,
Coop
Arthur B. Cooper Jr. "Coop"
Senior Network Engineer
Innerwall, Inc.
http://www.innerwall.com
acooper@innerwall.com
On Wed, 26 Apr 2006 08:43:01 -0500, Phil Frederick wrote
> On 4/24/06, Robert J. Kraus <rkraus@telcomtex.net> wrote:
> > To me it does look like a hash of some sort. Now that you have the known
> > password and the hash you can take that information and reverse engineer
> > the hashed answer.
> >
> > I am curious to see how they hashed it and what algorithm they used.
> > Once you have the hashing algorithm you can use that to unencrypt any
> > passwords in the file.
>
> Hashes are one way functions. You cannot work backward (or even
> reverse engineer - what would be the point?) from a hash and
> "decrypt" password. Even if the the hashing algorithm is MD5, SHA-
> 0/SHA-1
> (which have been shown to have collision weaknesses), finding a
> collision is unlikely. Reverse engineering is really not the answer
> (sort of).
>
> The most likely course would be to use a rainbow table or a
> dictionary attack. Use the known password and generate hashes using
> the different algorithms (MD5, SHA-0, SHA-1, TIGER, etc). When you
> find a match with the stored hash, you know the algorithm in use.
> Then all that is needed is start slamming a dictionary against the
> rest of the hashes, try some brute force variants. It gets a little
> more difficult if it turns out they are using a salt to XOR the password
> before the hash. Sometimes you can discover the salt by tracing the
> program execution in a debugger - but it's a real pain.
>
> I would also take images of the machine's memory. You would be
> surprised how many plaintext information floats around there. In my
> work I have found a few systems that use strong hashing/encryption
> algorithms vulnerable due to poor protocol implementation.
>
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