METHOD FOR DEACTIVATING AND REACTIVATING SECURITY MODULES

摘要

Method for deactivating and reactivating security modules, particularly for controlling access to conditional-access data. Such security modules comprise a plurality of registers (R1, R2, R3, Rn) containing values. The method comprises a step of transmitting at least one management message (RUN-EMM) containing an executable code which is loaded into a security module memory then executed. In particular, code execution can cause the register values to be mixed and/or encrypted, or rendered illegible. The method also enables previously deactivated security modules to be reactivated by means of a step of transmitting a further message containing an executable code (RUN-EMM<-1>) for reactivating the modules, which executable code has an opposite function to that of the executable code used to deactivate the security modules.