Broadcast data access controller communication system

H - Electricity – 04 – L

Patent

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Details

H04L 9/28 (2006.01) H04L 9/00 (2006.01) H04L 9/32 (2006.01) H04N 7/167 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2252998

Disclosed is a method and apparatus for enabling an authorized receiver station to decrypt encrypted information broadcast by a transmitter station, and for decrypting the information within the authorized receiver station. The method includes steps of storing a predetermined Subscription Key value in the authorized receiver station and, using the predetermined Subscription Key value, generating a Decryption Key value. In a next step the transmitter station broadcasts a signal which includes the encrypted information. After the broadcasted signal is received at the authorized receiver station, the authorized receiver station performs a predefined algorithm. The predefined algorithm uses the generated Decryption Key value to decrypt the encrypted information from the received signal.

L'invention est constituée par une méthode et un appareil servant à permettre à une station réceptrice autorisée de déchiffrer des informations diffusées par une station émettrice, et à déchiffrer ces informations dans cette station réceptrice autorisée. La méthode de l'invention stocke une valeur de clé d'abonnement prédéterminée dans la station réceptrice autorisée et, à l'aide de cette valeur de clé d'abonnement prédéterminée, produit une valeur de clé de déchiffrement. La station émettrice diffuse ensuite un signal contenant les informations chiffrées. Après la réception du signal diffusé à la station réceptrice autorisée, celle-ci exécute un algorithme prédéfini. Cet algorithme prédéfini utilise la valeur de clé de déchiffrement produite pour déchiffrer les informations contenues dans le signal reçu.

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