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The AACS’s cryptographic key management procedure uses Device Keys to decrypt one or more elements of a Media Key Block (MKB), in order to extract a secret Media Key (Km). A MKB is located on the physical support (the disc) together with the content of the disc encrypted.
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).
AACS can be used to revoke a key of a specific playback device, after it is known to have been compromised, as it has for WinDVD. [21] The compromised players can still be used to view old discs, but not newer releases without encryption keys for the compromised players.
Cyberlink, the company which sells the PowerDVD player, stated that their software could not have been used as part of these exploits. [19]On April 16, 2007, the AACS consortium announced that it had revoked the Device Keys used by both Cyberlink PowerDVD and InterVideo WinDVD, and patches were made available for users which provided uncompromised encryption keys and better security for the keys.
The reproduction device will have available its own keys, uniques for each model, called Device Keys. These keys are conceded by the AACS organization. In the moment of the reproduction, one of these keys will decrypt the MKB contained on the disc and as a result of this process we obtain the Media key. The Media key is combined with the VID ...
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Process to obtain the Media key, from the MKB and the Device Keys. The players have some keys, according to each model, called Device Keys, which are granted by the AACS organization. In the reproduction moment, one of these keys decrypts the contained MKB in the disc and as a result of this process, the Media Key, is obtained.
Desmond Ridder looks to lead the No. 4-ranked Bearcats (12-0, 8-0) to their second straight AAC title Saturday against No. 21 Houston (11-1, 8-0).