Patent ID: 7890770
Filing Date: 2011-02-15
Classification: G06Q,G07F,H04N

Abstract:
1. A method for deactivating and reactivating security modules intended for accessing control to conditional access data, the security module including a plurality of registers (R 1 , R 2 , R 3 , R n ) containing values, the method comprising: sending, by an operator, at least one management message containing an executable code (RUN-EMM), said executable code being loaded into a memory of the security module, reading the values contained in at least two registers, and modifying the values contained in said at least two registers using a scrambling code, said modification being done in a reversible way such that the initial values contained in said at least two registers are obtained by applying a descrambling code on the modified values and in which a result of the modification depends at least one of the initial values that were read in the registers,