Method for providing a secure communication between two...

H - Electricity – 04 – L

Patent

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H04L 9/30 (2006.01) H04L 9/08 (2006.01) H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2250833

In a method for providing a secure communication between two devices, a first device generates a random key (Ci) and transfers this key to a second device in a first message encrypted using a plublic key. The second device decrypts the first encrypted message by means of a corresponding secret key to obtain the random key (Ci) and this random key is used to encrypt and decrypt all transmissions between these devices. In a decoder for a pay TV system, comprising a conditional access module and a smart card, this method is applied to provide a secure communication between the control access module and the smart card and/or between the decoder and the conditional access module.

Dans un procédé servant à créer une communication sûre entre deux dispositifs, un premier dispositif génère un code à accès sélectif (Ci) et transfère ce code à un deuxième dispositif dans un premier message crypté au moyen d'un code public. Le deuxième dispositif décrypte le premier message crypté au moyen d'un code secret correspondant, afin d'obtenir le code à accès sélectif (Ci) et ce dernier est utilisé afin de crypter et de décrypter toutes les transmissions entre ces dispositifs. Dans un décodeur pour système de télévision payante, comprenant un module d'accès conditionnel et une carte intelligente, ce procédé permet d'établir une communication sûre, soit entre le module d'accès de commande et la carte intelligente, soit entre le décodeur et le module d'accès conditionnel.

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