Information recording/reproducing apparatus and method

G - Physics – 06 – F

Patent

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G06F 21/24 (2006.01) G11B 20/10 (2006.01) G11B 27/10 (2006.01) H04N 5/91 (2006.01) H04L 9/00 (2006.01)

Patent

CA 2372545

In a tree-structural key distribution system, renewed data of a master key and medium key are sent along with a key renewal block (KRB). KRB is such that each of devices included as leaves of a tree structure has a leaf key and restricted node key. A specific KRB can be generated for a group identified by a specific node and distributed to the group to restrict a device for which the key can be renewed. Any device not belonging to the group cannot decrypt the key, whereby the security of key distribution can be assured. Especially in a system using a generation-managed master key, a master key renewed with KRB can be distributed.

La mise à jour d'un code pilote et d'un code média est transmise avec un bloc de mise à jour de code (KRB) par l'intermédiaire d'un système de distribution de code d'une structure arborescente. Le KRB possède une conception dans laquelle les dispositifs constituant des feuilles de la structure arborescente comportent un code de feuille et un code de noeud limité et crée, puis distribue un bloc spécifique de mise à jour de code à un groupe indiqué par un noeud spécifique, ce qui limite les dispositifs pouvant être mis à jour. Tout dispositif n'appartenant pas au groupe ne peut pas décoder les données, ce qui confère une caractéristique de sécurité à la distribution des codes. En particulier, dans un système utilisant un code pilote dont la création est sous contrôle, un code pilote de mise à jour est distribué par un KRB.

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