Nagravision S.a.

Patrick Hauert

Olivier Brique

Christian Wirz

Henri Kudelski

Xavier Carrel

Grégory Duval

Gregory Duval

This invention concerns a security module deactivation and reactivation method particularly intended for access control of conditional access data. These security modules include a plurality of registers (R, R, R, Rn) containing values. The method includes the step of sending at least one management message (RUN-EMM) containing an executable code, this executable code being loaded into a memory of the security module and then executed. The execution of this code in particular can carry out the combination and/or the enciphering of the values of the registers, or render these values illegible. This method also allows the reactivation of the security modules that have been deactivated previously. In this case, the method includes the step of sending another message containing an executable code (RUN-EMM) for the reactivation of the modules, this executable code having an inverted function to that of the executable code used for the deactivation of the security modules.

Method for deactivating and reactivating security modules

The aim of this invention is to be able to recover specific information of a security module when it has been replaced by a new module in a user unit connected to a broadcasting network. This aim is reached by a method of storage and transmission of information generated by a first security module connected to a user unit, this first security module comprising a unique identifier and information representative of its functioning, this first module being able to be replaced by a second security module, this method comprising the following steps:

Method for storing and transmitting data generated by security module

Growing community of inventors

Lausanne, Switzerland

Patrick Hauert