Thread: BackupHDDVD, a tool to decrypt AACS protected movies
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Old 18th January 2007, 14:05   #926  |  Link
He-Man
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Quote:
Originally Posted by Touffi View Post
Second question, BackupHDDVD seems to work with Volume Unique Keys only, so what are the Variants used for ? Section 3.5 states that Title Key is computed with this formula : Kt = AES-128D(Ku, Kte). Kte being the encrypted Title Key and Ku "one of the volume unique keys defined in Section 3.3". Section 3.3 explains how to compute Volume Unique Keys (Kvu) and Volume Unique Keys Variants (Kvvu). So that would mean that we can feed BackupHDDVD either with a Kvu or au Kvvu and that you only need one of them to decrypt Title Keys ?

Well, I'm confused
Here's an article discussing Volume Variant Unique Keys, maybe this will be to some help?
AACS: Sequence Keys and Tracing: http://www.freedom-to-tinker.com/?p=1110
Last edited by He-Man; 18th January 2007 at 14:12.
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