| 摘要 |
This method for detecting illegal use of a security processor used for descrambling various multimedia contents broadcast on a plurality of respective channels involves: - incrementing (153) a counter Kchi by a predetermined step each time that, following the verification, a message ECMi,c is received within a time window immediately following a message ECMi,p and, in a converse case, reinitializing (158) the counter Kchi to its initial value, - detecting (162) illegal use as soon as the counter Kchi reaches a predetermined threshold. |
