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BackupHDDVD represented the first known successful attack against AACS. The utility circumvents content protection by decrypting video files directly with AES, the underling cryptographic cipher used by AACS. Using this technique, BackupHDDVD is able to completely bypass the AACS chain of trust, rendering it immune to revocation.
AACS uses cryptography to control and restrict the use of digital media. It encrypts content under one or more title keys using the Advanced Encryption Standard (AES). Title keys are decrypted using a media key (encoded in a Media Key Block) and the Volume ID of the media (e.g., a physical serial number embedded on a pre-recorded disc).
The AACS system relies on a subset difference tree combined with a certificate revocation mechanism to ensure the security of high definition video content in the event of a compromise. Even before AACS was put into use, security researchers expressed doubts about the system's ability to withstand attacks. AACS decryption process
The AACS LA confirmed on January 26 that the title keys on certain HD DVDs had been published without authorization. [29] Doom9.org forum user arnezami found and published the "09 F9" AACS processing key on February 11: Nothing was hacked, cracked or even reverse-engineered btw: I only had to watch the "show" in my own memory.
The MKB is generated by AACS LA, and allows all compliant devices, each using their set of secret Device Keys, to calculate the same Media Key (Km). If a set of Device Keys is compromised in a way that threatens the integrity of the system, an updated MKB can be released that causes a device with the compromised set of Device Keys to be unable ...
This situation has become even worse with the recent publication in multiple web sites of the Media Key, that is, the key that allows decrypting the Volume ID [4] and at the same time, the encrypted content, without the need of using a certified device by the AACS or a valid MKB. This is especially critical because nowadays the Volume ID is the ...
AACS may refer to: . Advanced Access Content System, a standard for content distribution and digital rights management . AACS encryption key controversy; American Association of Christian Schools, an organization that unifies individual Christian schools and statewide Christian school associations
HE-AAC is supported in the open source FAAD/FAAD2 decoding library and all players incorporating it, such as VLC media player, Winamp, foobar2000, Audacious Media Player and SonicStage. The Nero AAC Codec supports decoding HE and HEv2 AAC. HE-AAC is also used by AOL Radio and Pandora Radio clients to deliver high-fidelity music at low bitrates.