Patent ID: 7224804
Filing Date: 2007-05-29
Classification: G06F,G11B,H04L

Abstract:
1. An information processing device having a key set consisting of a leaf key assigned to each leaf and node keys assigned on paths from the leaf key to an upper layer of a hierarchical tree structure having assigned leaves and nodes, the information processing device comprising: a processor configured to trace a key location identification tag identifying a location in an enabling key block including encrypted key data resulting from encryption of a renewal node key of the hierarchical tree structure by a subordinate node key or a leaf key, based on a identifier or an entity corresponding to a node or a leaf; the processor verifying whether the entity is to be revoked in accordance with the trace; and encryption processing means configured to decrypt the enabling key block using the key set, wherein the processor determines verification of the information processing device by determining whether the encryption processing means can decrypt the enabling key block or not.