DVD KeyFinding algorithm

[doomDVD]

Hi all, this is my first post to this forum.

i have downloaded VobDec and Decss-Plus2 and noticed that they fail to find a key on the file VTS_02_0.vob of training day.
yet smart ripper finds the key with no problem at all, i am trying to create my own DVD decryption app, to release as freeware.

does anyone have an alternative keyfinding algorithm. or can anyone point me to a better open source keyfinding algorithm.

thanx in advance
doomDVD,
:devil:

[gabest]

Vobdec and decssplus are "plain text attacks", they only work if the vob is vulnerable. There is a normal way to find the title key too (negotiating the bus key, getting the disc keys, decoding one with the player key and using it to decode the title key).

[doomDVD]

ok thanx gabest, are there examples of this method on the net anywhere.

regards
doomDVD,

[gabest]

There is the source code of the first version of decss, it is hard to find but not impossible. It has only one player key, but you can find more in mplayer's source code.

[Nic]

Also look in the videolan's dvd reading library, they have good GetTitleKey code as well as a list of player keys and other methods, etc.

For a possibly more readable version of the plaintext attack look at minidec in the misc part of my site,

-Nic

[doomDVD]

thanks alot Nix, and Gabest you have both been a great help

regards
DoomDVD