[streaming] Re: CSA Video Encryption in VLC 0.8.1

[Rémi Denis-Courmont]

Le mardi 30 janvier 2007 15:58, Georgi Chorbadzhiyski a écrit :
> anita devi wrote:
> > Does VLC have support for AACS decryption too?
                                   ^^^^^^^^^^

AACS (brute force) *decryption* is impossible according to current 
publicly available scientific knowledge. It would involve breaking 
Rijndael-128 (AES). Compare that to CSS *40* bits... Besides, I surely 
hope it does not get broken because it would mean SSL, IPsec, OpenGPG 
and what not are probably broken too.

Still...

> Heh, of course not. I don't see how Hollywood will give keys to
> GPLed player.

...VLC could implement AACS regardless, so that it can decipher HD-DVD 
either if you know the volume key (essentially what BackupHDDVD does I 
believe), or managed to extract one of "your" device key - which you'd 
better keep secret. I suppose this is legal inasmuch it does not 
work-around the protection since you still need the key - someone 
correct me if I'm wrong.

By the way, we already have AES-128 implementation in VLC 
through libgcrypt (which is already required by the TLS plugin).

Anyway, VLC support for clear-text HD-DVD (EVO files) is very far from 
complete. That's obviously got to be sorted out first (hint: patch 
wanted).

-- 
Rémi Denis-Courmont
http://www.remlab.net/
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