Viaccess

Olivier Granet

Bruno Tronel

Quentin Chieze

Patrick Soquet

Emmanuel Barau

Pascal Danois

Sébastien Le Henaff

Louis Neau

Alain Cuaboz

Alexandre Giard

Matthieu Roger

Renaud Presty

This method in which an attempt to attack a security processor is detected by the security processor itself comprises:

Method for detecting an attempted attack, recording medium, and security processor for said method

Security processor () for a decoder able to receive a scrambled multimedia signal, this processor comprising: &#x2014;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, &#x2014;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.

Security processor and recording method and medium for configuring the behaviour of this processor

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Suresnes, France

Olivier Granet