H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/28 (2006.01) G06F 12/14 (2006.01) G06F 21/00 (2006.01) G11B 20/00 (2006.01) H04L 9/08 (2006.01) H04L 29/06 (2006.01) H04N 5/913 (2006.01) H04N 7/167 (2006.01)
Patent
CA 2419972
The object of the present invention is to provide a data protection system that reduces to a degree the amount of encrypted data that is distributed to a multiplicity of terminals, and that has a structure in which a terminal whose decryption keys are exposed by a dishonest party is made unable to decrypte the data correctly, while other terminals are able to decrypt the data correctly. The present invention is a data protection system that includes a multiplicity of terminals, and an encryption device that encrypts distribution data that is distributed to each terminal. Each terminal is corresponded with one node on a lowest level of 4-ary tree structure or the like that has a plurality of hierarchies. The data protection system, for each node in the tree structure, excluding those on the lowest level, determines a plurality of combination patterns that include combinations of two or more of all four nodes that are reached one level below the node, decides an individual decryption key for each determined combination pattern, further decides an individual decryption key for each node on the lowest level, and has each terminal store all decryption keys decided for the nodes on the path from the node on the lowest level that corresponds to the terminal through to the node on the highest level. The data protection system prescribes nodes reached from the node on the lowest level that corresponds to the terminal through to the node on the highest level that correspond to a terminal that has been dishonestly analyzed as invalid nodes. For invalid nodes, other than invalid nodes on the lowest level, the data protection system designates an encryption key that corresponds to the decryption key decided in correspondence with the combination pattern that combines all nodes, excluding invalid nodes, of the four nodes that are reached one level below the node, and has the encryption device encrypt distribution data that uses each of the designated encryption keys.
La présente invention est un système de protection de données comprenant une multiplicité de terminaux et un dispositif de chiffrement destiné à chiffrer des données de distribution distribuées à chaque terminal. Chaque terminal correspond à un noeud au plus bas niveau d'une structure arborescente quaternaire ou semblable comprenant une pluralité de hiérarchies. Pour chaque noeud de la structure arborescente, sauf au plus bas niveau, ledit système de protection des données détermine une pluralité de modèles de combinaisons comprenant des combinaisons de deux ou de plusieurs des quatre noeuds qui sont atteints un niveau en dessous du noeud, détermine une clé de chiffrement individuelle pour chaque modèle de combinaison déterminé, détermine également une clé de chiffrement individuelle pour chaque noeud au plus bas niveau, et stocke dans chaque terminal toutes les clés de chiffrement déterminées pour les noeuds sur la trajectoire du noeud au plus bas niveau correspondant au terminal jusqu'au noeud au plus haut niveau.
Matsuzaki Natsume
Nakano Toshihisa
Ohmori Motoji
Tatebayashi Makoto
Matsushita Electric Industrial Co. Ltd.
Panasonic Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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