Method for verifying validity of domestic digital network key

H - Electricity – 04 – N

Patent

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Details

H04N 7/10 (2006.01) H04N 5/913 (2006.01) H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2494999

The invention relates to a method for checking conformity of a network key (NK). The inventive method is used for transmitting data from a conditional access source to a domestic network and consists in verifying the authencity of a network key (NK) by means of pertinent control data provided by a verification centre in the form of a list { (TK)<SB>NK1</SB>, (TK)<SB>NK2</SB>, (TK)<SB>NK3</SB> }. The verification of the presence or absence of a cryptogram (T K)<SB>NK </SB>is carried out according to the list { (TK)<SB>NK1</SB>, (TK)<SB>NK2</SB>, (TK)<SB>NK3</SB> }. The cryptogram (T K)<SB>NK</SB> is produced on the basis of a test key (TK) delivered by the centre for verification of encryption, by the network key (NK) of the safety module (CT) of a device (TV1, TV2, PC) connected to the network.

Le but de la présente invention est de proposer une méthode de contrôle de la conformité d'une clé de réseau (NK). Cette méthode s'applique lors du transfert de données provenant d'une source ô accès conditionnel vers un réseau domestique. Il s'agit de vérifier l'authenticité d'une clé de réseau (NK) par l'intermédiaire de données de contrôle pertinentes fournies par le centre de vérification en général sous forme d'une liste {(TK)NK1, (TK)NK2 , (TK)NK3 }. Une vérification de la présence ou de l'absence d'un cryptogramme (TK)NK est effectuée selon la liste {(TK)NK1, (TK)NK2 , (TK)NK3 }. Le cryptogramme (TK)NK est constitué ô partir d'une clé de test (TK) fournie par le centre de vérification encryptée par une clé de réseau (NK) d'un module de sécurité (CT) d'un appareil (TV1, TV2, PC) connecté au réseau.

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