System and method for transmitting encrypted data with...

H - Electricity – 04 – L

Patent

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H04L 9/16 (2006.01) H04N 21/6334 (2011.01)

Patent

CA 2442534

The invention concerns a method for data transmission between a transmitting station (100e) and a plurality of receiving stations (100r) which consists in transmitting from the transmitting station to the receiving stations data encrypted with a first key, and at least a control message transporting a second key. The invention is characterised in that the first key, used for decrypting, is recovered in each receiving station from the second key and from at least a data selected among the set of data available in the receiving stations, based on a selection command periodically transmitted between the transmitting station and the receiving station. The invention is applicable to pay television. FIG. 2: 104e, 114e, 116e, 122e, 124e ENCRYPTION UNITS 104r, 114r, 116r, 122r, 124r DECRYPTION UNITS A ENCODING KEY B ENTITLEMENT CONTROL MESSAGE C ENTITLEMENT MANAGEMENT MESSAGE D OPERATING KEY E CLIENT KEY S COMMAND MESSAGE

La présente invention concerne un procédé de transmission d'informations entre une station émettrice (100e) et une pluralité de stations réceptrices (100r) dans lequel on transmet de la station émettrice vers la station réceptrice des informations chiffrées avec une première clé, et au moins un message de contrôle vecteur d'une deuxième clé. Conformément à l'invention, la première clé, utilisée pour un déchiffrement, est rétablie dans chaque station réceptrice à partir de la deuxième clé et d'au moins une donnée sélectionnée parmi un ensemble de données disponibles dans les stations réceptrices, en fonction d'une commande de sélection transmise périodiquement entre la station émettrice et la station réceptrice. Application à la télévision payante.

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