System and method for reduced hierarchy key management

H - Electricity – 04 – N

Patent

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Details

H04N 21/4405 (2011.01) H04L 9/14 (2006.01) H04L 9/16 (2006.01) H04N 7/24 (2011.01)

Patent

CA 2576460

A controller for managing media stream decryption keys includes a media decryption engine, a table, and a content key list. The media decryption engine receives an encrypted media stream from a headend and presents a decrypted media stream to a receiving device in response to a decryption key, wherein the decryption key is a function of a content key. The table contains a content key index and a plurality of corresponding content keys. Content keys that correspond to a particular encrypted media stream are selected from the content key list using an index from the content key table, and that is referenced by an identifier received from a headend in connection with the encrypted media stream.

Un contrôleur assurant la gestion de clés de décryptage pour flux de media comprend un moteur de décryptage de media, un tableau et un liste de clés de contenus. Le moteur de décryptage de media reçoit un flux de media crypté en provenance d'une tête de réseau et présente un flux décrypté à un dispositif récepteur après usage d'une clé de décryptage, ladite clé étant fonction d'une clé de contenu. Le tableau renferme un index de clés de contenus et une pluralité de clés de contenus correspondantes. Les clés de contenus correspondant à un flux de media crypté particulier sont choisies dans la liste de clés au moyen d'un index du tableau de clés de contenus, qui est référencé par un identifiant reçu d'une tête de réseau pour le flux de media crypté.

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