The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2011
Filed:
Aug. 29, 2005
Henri Kudelski, Chexbres, CH;
Olivier Brique, Le Mont-sur-Lausanne, CH;
Christian Wirz, Lausanne, CH;
Patrick Hauert, Lausanne, CH;
Henri Kudelski, Chexbres, CH;
Olivier Brique, Le Mont-sur-Lausanne, CH;
Christian Wirz, Lausanne, CH;
Patrick Hauert, Lausanne, CH;
Nagravision S.A., Chesaux-sur-Lausanne, CH;
Abstract
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.