John -
If what you are describing is an encrypted field within the database, I
am not sure that there is anything you can do to determining what the
algorithm is. If it is good encryption, the data should be random bits.
If you know the encryption key, then you could try a number of the
common algorithms to see if they yield valid data. Otherwise, you are
going to have to try both the algorithm and the keys, (a very very
difficult task with normal algorithms). You might have to resort to pure
cryptographic analysis techneques to solve this issue.
Bob
-----Original Message-----
From: Tim [mailto:pand0ra.usa@gmail.com]
Sent: Thursday, 11 May, 2006 16:09
To: John Madden
Cc: pen-test@securityfocus.com
Subject: Re: Determining the encryption used
From what I have picked up cracking passwords, Cain (windows app from
oxid.it) has numerous decryption methods in it and will tell
you if the hash does not fit. As for the length some
encryption protocols can be identified by their length (do
not know off the top of my head though).
On 5/11/06, John Madden <chiwawa999@yahoo.com> wrote:
Hi,
While doing a pen-test I came across a database with
encrypted fields
and I was curious to try and see what I would do with it.
Is it possible to determine the encryption used by "looking" at the
encrypted results or lenght ?
I know that with Base64 it's pretty easy because of the "==" at the
end.
I would like to learn more about the subject and considering the
amount of documentation out there, I would like your
comments on what
you have used and found usefull.
Also if there are any tools besides openssl that you found
usefull to
try all the cipher, consecutively with a passphrase/keyword
against a
file/string
Thank you for your time.
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