CSS Cipher implementation

[NeonMan]

Hi!
Does anyone known where I can find an implementation to encrypt/decrypt CSS streams?
I'm not looking for a DeCSS-Like program but rather a program like mcrypt, able to (de)encrypt streams given a key or simply an implementation of the cipher.

[Shinigami-Sama]

uhh....
7zip?

[NeonMan]

What do you mean with 7Zip?

on http://www.dvd-copy.com/news/cryptanalysis_of_contents_scrambling_system.htm the cipher is defined so I'll implement it from that, it is REALLY simple (and weak), basically two LFSR (http://en.wikipedia.org/wiki/LFSR)(16 + 1 bit and 24 + 1 bit each one) with parts of the key as seed being continuously iterated to generate the cipher's stream.

<edit>
http://www.cs.cmu.edu/~dst/DeCSS/Kesden/index.html
Full description of the CSS scheme with description of the cipher. The other document describes the cryptanalyses
</edit>

[Adub]

May I ask why?

[NeonMan]

Simply I wanted to understand the weakness in the scheme, particulary the weakness of the cipher (I can't believe it is that simple!)

[blutach]

I thought DVD Jon had it on his T-Shirt :)

Regards

[linx05]

You can have it on a tie too! http://www.cs.cmu.edu/~dst/DeCSS/Gallery/

[Ajax_Undone]

Hey I have one of those ties in my closet...