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A Spotter's Guide to AACS Keys

Peter Eckersley
Chaos Communication Congress 24th (24C3) 2007
Indexed on
Mar 27, 2013
File name
File size
26.8 MB

AACS is the DRM system used on HD-DVD and Blu-Ray discs. It is one of the most sophisticated DRM deployments to date. It includes around twelve different kinds of keys (in fact, even counting the different kinds of keys is non-trivial), three optional watermarking schemes, and four revocation mechanisms (for keys, hardware, players, and certain disc images). AACS has been repeatedly cracked. Its revocation mechanisms are intended to ensure that none of these cracks is permanent, but the evidence so far suggests that crackers will continue to win against it. The talk will explain the many types of AACS keys, how the system fits together, why it will keep breaking, and what Hollywood gains by using it anyway. We will also consider whether it is possible for DRM to be any more evil. Is BD+ (an optional, Blu-Ray only DRM system) going to be worse for users? Will future generations of DRM be worse? Or, if the free world can survive AACS, can it survive anything?

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