PROCESSEUR DE SECURITE ET PROCEDE ET SUPPORT D'ENREGISTEMENT POUR CONFIGURER LE COMPORTEMENT DE CE PROCESSEUR

• Main Authors: GRANET OLIVIER, DANOIS PASCAL, LE HENAFF SEBASTIEN
• Format: Patent
• Language: French
• Published: 16.01.2009
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

Security processor (42) for a decoder able to receive a scrambled multimedia signal, this processor comprising: -at least one first rewritable lock (FIELDKEY, FIELDPIEMM, FIELDPIEMMC, FIELDPIECM, FIELDFCT) whose value can be toggled between a first and a second predetermined value in response to an EMM or ECM message, -a restriction function able to authorize and, alternately, prohibit, as a function of the value of the first lock, only one particular operation of the security processor, this particular operation being chosen from the group composed of: the use of a cryptographic key, the processing of a parameter contained in an EMM or ECM message received, and the execution of an elementary conditional access function of the code of the application.