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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.
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.
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 The MKB is distributed in blocks that contain the version of the Media key, the list of devices that have been revoked, a field to authenticate the MKB, and other fields that specify parameters corresponding to the decrypting algorithm ...
Customer care can’t override this process of determining App Password creation eligibility. Sign in to your AOL Account Security page. Click Generate app password or Generate and manage app passwords. Click Get Started. Enter your app's name in the text field. Click Generate password. Use the one-time password to log in to your 3rd party app .
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.
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