US 2010/0169664 A1Published application

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

AssigneeViaccess

InventorsPascal Danois, Olivier Granet, Sébastien Le Henaff

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Abstract

Security processor (42) for a decoder able to receive a scrambled multimedia signal, this processor comprising:—at least one first rewritabie 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.

Claims14

Dependent claims

Security processor for a decoder suitable for receiving a multimedia signal scrambled with the aid of a control word, this signal being broadcast by a network head, this processor comprising a non-rewriteable memory containing an application code which, when it is executed by a microprocessor, makes it possible to execute a set of operations necessary for processing ECM messages (Entitlement Control Message) and EMM messages (Entitlement Management Message) so as to extract therefrom the control word necessary for descrambling the scrambled multimedia signal

wherein,
the security processor comprises at least one first rewriteable lock (LOi, LPi, LCi, LEi, LFi) whose value can toggle between a first and a second predetermined value in response to an EMM or ECM message,
the application code also contains a restriction function able to permit and, alternately, to prohibit, in response to the receipt of one and the same ECM or EMM message and as a function of the value of the first lock, only a particular operation of the security processor from the set of operations necessary for processing ECM and EMM messages, while allowing the security processor to execute the other operations that are necessary for processing the EMM and ECM messages and that have not been prohibited, this particular operation being chosen from the group made up of:
the use of a cryptographic key recorded in a memory of the security processor,
the processing of a parameter contained in an EMM or ECM message received, and
the execution of an elementary conditional access function for the application code, each elementary conditional access function for the application code being executed independently of the other elementary conditional access functions so that the non-execution of an elementary conditional access function does not prevent the execution, by the microprocessor, of any one of the other elementary conditional access functions.

3 more elements

Method of configuring the behavior of a security processor for a decoder suitable for receiving a multimedia signal scrambled with the aid of a control word, this signal being broadcast by a network head, this method comprising:

the provision of at least one first rewriteable lock whose value can toggle between a first and a second predetermined value in response to an EMM message,
the permitting and, alternately, the prohibiting, in response to the same EMM or ECM message and as a function of the value of the first lock, of only a particular operation of the security processor from the set of operations necessary for processing the ECM and EMM messages, while allowing the security processor to execute the other operations that are necessary for processing the EMM and ECM messages and which have not been prohibited, this particular operation being chosen from the group made up of:
the use of a cryptographic key recorded in a memory of the security processor,
the processing of a parameter contained in an EMM or ECM message received, and
the execution of an elementary conditional access function by the security processor, each elementary conditional access function being executed independently of the other elementary conditional access functions so that the non-execution of an elementary conditional access function does not prevent the execution, by the security processor, of any one of the other elementary conditional access functions.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/438,061Filed 29 Aug 2007
Priority: FR 060763130 Aug 2006
Published: 1 Jul 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04N 21/4181
External card to be used in combination with the client device, e.g. for conditional access: for conditional access
G06F 21/72
To assure secure computing or processing of information: in cryptographic circuits
H04L 63/0428
For providing a confidential data exchange among entities communicating through data packet networks: wherein the data content is protected, e.g.…
H04L 63/10
Network architectures or network communication protocols for network security: for controlling access to devices or network resources

Family

US 9,332,297 B2Related patent
US 2010/0169664 A1This patent

From the US filing history. Foreign family members aren’t listed.

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