| 摘要 |
The present invention relates to a method of verifying the integrity of system data, particularly of copy protection information like an Effective Key Block or a Media Key Block including revocation data for revoking untrusted devices. At present cryptographic information relating to content-protection is prerecorded on disks. In order to avoid that this information is changed which poses a security risk, a cryptographic hash of the cryptographic information is stored on the disk in read-only manner according to a known method. However, the processing according to a known method is slow and increases the start-up time. This problem is solved according to the present invention by a method of verifying the integrity of system data, comprising the steps of: generating a cryptographic key from said system data, generating check data from said cryptographic key using a hash function, and verifying the integrity of said system data by comparing the generated check data with a trusted version of said check data. The invention further refers to a method generating such check data, to corresponding apparatuses, to a storage medium and to a computer program.
|
