HD DVD's AACS Protection Bypassed. In Only 8 Days?!
The hacker not only offers a link to the executable and the source code, but also sends a link that redirects you to…YouTube, showing in detail how he cracked the AACS protection that hindered him from watching HD movies on Windows.
But what is the famous AACS? The Advanced Access Content System (AACS) is a standard for content distribution and digital rights management, which will allow restricting access to and copying of the next generation of optical discs and DVDs.
The group developing it includes Disney, Intel, Microsoft, Matsushita (Panasonic), Warner Brothers, IBM, Toshiba, and Sony. The standard has been adopted as the access restriction scheme for HD DVD and Blu-ray Disc.
The proposal is based on broadcast encryption using Naor-Naor-Lotspiech subset difference trees. The proposal was voted one of the technologies most likely to fail by IEEE Spectrum magazine. Concerns about the approach include its similarity to past systems that failed, such as Content Scrambling System (CSS), and the inability to preserve security against attacks that compromise large numbers of players. Indeed, Jon Lech Johansen (known colloquially as "DVD Jon") who defeated the original CSS encryption expected AACS to be cracked by Winter 2006/2007.
The principal difference between AACS and earlier content management systems such as CSS is in the means by which title-specific decryption keys are distributed. Under CSS, all players of a given model are provisioned with the same, shared decryption key. Content is encrypted under the title-specific key, which is itself encrypted under each model's key.
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