Nagravision S.a.

Nagra France

Joel Wenger

Corinne Le Buhan

Christophe Nicolas

Joel Conus

Daniel Lecomte

Bertrand Wendling

Fabien Gremaud

Nicolas Fischer

Guy Moreillon

Nikolai Keychenko

A method for managing communications within a network comprising utility meters, each associated and connected to at least one utility management center through at least one intermediate data concentrator. A message is sent by a utility meter to the destination data concentrator. This message includes metering data measurement reported by said utility meter, its utility meter identifier, the destination data concentrator identifier and the management center identifier. Then, on the basis of several metering data measurements, a metering counter differential consumption value is calculated by difference of two metering counter consumption indexes measured by the utility meter within a time period interval. Then, a report containing at least the metering counter differential consumption value is sent from the destination data concentrator towards the utility management center to which said utility meter is associated.

System and method to manage utility meter communications

A secure detachable utility monitoring device is disclosed, to be appended to a utility metering apparatus for controlling at least one utility usage consumption. A detachable metering monitoring device of at least one embodiment includes: a usage reading interface to acquire a utility consumption value metered by the utility meter; a first memory to store at least a unique identifier ID and a personal key, both pertaining to the device; a crypto processor to generate a cryptogram from information data comprising at least the utility consumption value, the cryptogram being encrypted with the personal key; a message generator to generate an information message including at least the cryptogram and the unique identifier ID; and a communication network interface including a sending unit to send the information message to a remote management center.

System and method to record encrypted content with access conditions

A method for authenticating a user to a provider, among a plurality of providers. The method uses an authentication device comprising, for each of provider, a record comprising a pairing key and first data, both as shared data. Provider authentication data comprises a first cryptogram obtained by encrypting said first data with said pairing key. Authenticating provider authentication data is performed at the authentication device by the steps of decrypting said first cryptogram by means of the pairing key stored in one of said records, then comparing the result of this decryption with first data resulting from pairing data stored in said record, if the comparison does not indicate a match, then processing again the previous decryption and comparison steps by using the pairing key of another record until each of said records stored in the authentication device has been processed.

Method using a single authentication device to authenticate a user to a service provider among a plurality of service providers and device for performing such a method

Methods and systems are disclosed for distributing video sequences in a coded stream. The methods and systems include analyzing an original coded stream, generating at least one modified coded sub-frame, generating, based upon the analysis, a modified stream and a second stream by replacing an original coded sub-frame by the modified coded sub-frame, so that the modification from the original coded sub-frame results in a visually altered video sequence, transmitting the first and the second generated streams, and reconstructing the original stream using the modified coded sub-frame contained in the second stream.

Device for secure transmission recording and visualization of audiovisual programs

Unit for secure processing access controlled audio/video data capable of receiving control messages (ECM) comprising at least one first control word (CW) and first right execution parameters (C), at least one second control word (CW) and second right execution parameters (C), said processing unit being connected to a first access control device (CA), said processing unit is characterized in that it comprises: &#x2014;means for verifying and applying the first right execution parameters (C) in relation to the contents of a memory (M) of said first access control device (CA) and means for obtaining the first control word CW, &#x2014;a second access control device (CA) integrated into the processing unit UT including means for verifying and applying the second right execution parameters (C) in relation to the contents of a memory (M) associated to said second access control device (CA) and means for obtaining the second control word (CW), &#x2014;a deciphering module (MD) capable of deciphering, sequentially with the first and the second control word (CW) and (CW), the access controlled audio/video data, said control words (CW) and (CW) being provided by the first and second access control devices (CA, CA) and stored in said deciphering module (MD). A method for secure processing digital access controlled audio/video data carried out by said unit is also an object of the present invention.

Unit and method for secure processing of access controlled audio/video data

A method for protecting multimedia data exchanged between a multimedia processing device and a security module managed by a management center, the multimedia processing device receiving an encrypted multimedia data, decrypting the encrypted multimedia data and converting the decrypted multimedia data, said multimedia processing device including a personal key, the method comprising obtaining an identifier pertaining to an entity representing a group of multimedia processing devices, calculating a security key formed by a one-way function based on the personal key of the processing multimedia device and the entity identifier, transmitting this security key and the entity identifier to the security module connected to said multimedia processing device, calculating the security key using a one-way function based on the personal key of said multimedia processing device and the entity identifier, and using the calculated security key to secure the data exchanged between the multimedia processing device and the security module.

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Etoy, Switzerland

Joel Wenger