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RE: RE: Password secured using?
From: "Dario Ciccarone (dciccaro)" <dciccaro () cisco com>
Date: Wed, 26 Apr 2006 16:02:57 -0400

Yeah, here's is an idea. Looks like a table and a simple XOR. Theory:

'encrypted' password is represented as:

[1 nibble][encrypted bytes]

[1 nibble] = starting position into XOR/translation table

So, as an example:

a=285 

Would mean:

'starting from position 2 in the table for the algorithm, and password,
encrypted, is 0x85'

And this:

aaa = 0401785

confirms our hyphotesis - 'start from position 0 on the table, 1st char
(pos 0) is 0x40, 2nd (pos 1) is 0x17, 3rd (pos 2) is 0x85' - which is
consistent with our previous observation.

One nibble = 16 possible starting points - so the table will look like:

1234567890123456
ABCDEFGHIJKLMNOPABCDEFGHIJKLMNOPABCDEFGHIJKLMNOPABCDEFGHIJKLMNOP

Keep generating passwords - use 'a' x 48 or similar - reconstruct the
table - try and see if is a XOR or a straight substituion cipher. Good
luck.

Dario

-----Original Message-----
From: barcajax () gmail com [mailto:barcajax () gmail com] 
Sent: Wednesday, April 26, 2006 2:44 AM
To: pen-test () securityfocus com
Subject: Re: RE: Password secured using?

Thanks for the various responses I received regarding my 
question. As Jim suggested, I tried entering variations of 
the password and recorded them down as they appeared in the 
config file after I saved them. Here they are.
a=a5b
aa=553c6
aaa=0401785

a=553
aa=9455b
aaa=83e455b


a=285
aa=7073e
aaa=0401785

a=707
aa=a5b40
aaa=9455b40

a=358
aa=9455b
aaa=a5b401

         There are consistencies. Single letter password 
appears as 3 characters in the config file, two letter shows 
up as 5 and three letter as 7. Repeat patterns include 
repeating 707, 553, a5b and 040. I did manage to get a 
collision where aaa had repeats of 0401785. Any ideas? 

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