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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).
Through a standard AES library, it then decrypts each video file on the disc using the appropriate keys and writes the results to a location specified by the user. Direct file decryption allows the utility's functionality to remain unaffected by device key revocation and its performance unencumbered with AACS overhead.
Media Key Block structure. Even though it seems a simple mechanism the MKB key which is found in the physical support of the disc follows a complex structure. The MKB is distributed in blocks that contain the version of the Media key, the list of devices that have been revoked, a field to authenticate the MKB, and other fields that specify parameters corresponding to the decrypting algorithm ...
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
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. The Media Key is combined with the VID (Volume ID) and the Volume Unique Key (KVU) is originated so that the decryption of the Encrypted Title Key can finally be done and in consequence the necessary ...
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. MKB enables system renewability.
A disc-key can be recovered from its hash-value at a complexity of 2 25. The latter exploit recovers a disk-key from its hash-value in less than 18 seconds on a 450 MHz Intel Pentium III. The CSS design was prepared for the leak of a few player-keys. New discs would not contain an encrypted variant for these player-keys in the disc-key-block.
In computing, ROM Mark or BD-ROM Mark is a serialization technology designed to guard against mass production piracy or the mass duplication and sale of unauthorized copies of pre-recorded Blu-ray Discs.