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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 ...
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.
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).
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 The MKB is distributed in blocks that contain the version of the Media key, the list of devices that have been revoked, a field to authenticate the MKB, and other fields that specify parameters corresponding to the decrypting algorithm ...
On January 24, 2007 AACS LA issued a statement acknowledging that AACS security had been compromised while urging software vendors to limit the availability of keys in memory. [21] Beginning with discs manufactured in late April, versions of PowerDVD and WinDVD responsible for leaking keys have been revoked and free updates are available to ...
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 discs have a volume identifier called VID , the Encrypted Title Key and a decryption key (Media Key Block). 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 ...
[1] [2] [3] Votes by 15,000 Digg users drove an article about the encryption key to the front page of the site. [1] [3] The Advanced Access Content System (AACS), the organization which controlled access to the HD DVD encryption key, sent a cease and desist letter to Digg on May 1, 2007.