From: Tim (tim-pentest@sentinelchicken.org)
Date: Wed Apr 26 2006 - 17:57:44 EDT
> When I repeated it often enough. I got this pattern.
> a=707
> aa=7073e
> aaa=7073e45
> aaaa=7073e455b
Looks to me like they are using an iterative hashing function,
operating on one byte at a time. If I understood your previous emails,
It appears they may be using a 1 character salt and are representing the
binary output of the hashing function as hexadecimal (two digits per
byte).
This of course is just a guess, but given the length of the output is a
function of the length of the input (specifically, the function:
f(x)=2*x+1), and the output is salted in some way, the 1 is probably the
salt.
Now, if you generate enough hashes and count the collisions, you could
easily calculate the true entropy of the salt, and thus the length.
Oh, also, it's possible the hash is really a password encrypted with a
stream cipher with a really weak IV.
hope that helps,
tim
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