des / 3des question

[iceman]

Hi,

I understand that Hashcat is a tool for solving hashes, really fast by the looks of it. And I'm into RFID security, where I get to deal with the underlying crypto-algos. At the moment three algos is kind of interesting, DES/3DES/AES to me.

I my world, I've both plain & enc messages. Kind of easy, no salts nor nothing. Just encrypted 8bytes, and I want to use the interesting ideas used from modern pwd breakers like Hashcat, to reverse the key. Bruteforce is raw by nature.

What I'm looking for is sourcecode or a way being able to use the ideas & speed of Hashcat for my purposes. I stumbled here after I read the link below. I thinking in terms of calling Hashcat dll to provide with a possible solution. How do I do that? Making a new "-m " type? plugin?



REF:
http://www.reddit.com/r/crypto/comments/...ruteforce/

Which is still bruteforce,and the link is down.

[Rolf]

Hashcat and Ocl/Cudahc are closed source software.
In your case, there seems to be no hash to crack, just raw encryption, which isn't what the software does.

[iceman]

Yeah, I was wishing for an opensource alternative, but thats me with no luck.

[iceman]

IN the proxmark3 community dealing with rfid sec, we usually have very small messages. Like 8bytes, which could be seen as a hash. Not so often they use a salt to a masterkey, but they do mix it up with a unique card id. So similar and yet not.

[atom]

As I said already, you can't brute-forece AES or 3DES. The only chance is if there's a human involved in the crypto process. If a human chooses a password it's typically send through a KDF which is then uses as the cipher key. That means if you want a way to crack those systems you need to find out how the KDF produces the crypto key and explain it in detail. Afterwards we can add the same scheme/structure to oclHashcat.