Monty Solomon (monty@roscom.com) Wed, 24 Jan 2007 22:13:14 -0500

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AACS Decryption Code Released by Ed Felten Decryption software for AACS, the scheme used to encrypt content on both next-gen DVD systems (HD-DVD and Blu-ray), was released recently by an anonymous programmer called Muslix. His software, called BackupHDDVD, is now available online. As shipped, it can decrypt HD-DVDs (according to its author), but it could easily be adapted to decrypt Blu-ray discs. Commentary has been all over the map, with some calling this a non-event and others seeing the death of AACS. Alex Halderman and I have been thinking about this question, and we believe the right view is that the software isn't a big deal by itself, but it is the first step in the meltdown of AACS. We'll explain why in a series of blog posts over the next several days. Today I'll explain how the existing technology works: how AACS encrypts the content on a disc, and what the BackupHDDVD software does. http://www.freedom-to-tinker.com/?p=1104 AACS: Extracting and Using Keys http://www.freedom-to-tinker.com/?p=1106 AACS: Blacklisting, Oracles, and Traitor Tracing http://www.freedom-to-tinker.com/?p=1107 AACS: Game Theory of Blacklisting http://www.freedom-to-tinker.com/?p=1108 AACS: Title Keys Start Leaking http://www.freedom-to-tinker.com/?p=1109 AACS: Sequence Keys and Tracing http://www.freedom-to-tinker.com/?p=1110 AACS: Modeling the Battle http://www.freedom-to-tinker.com/?p=1111

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