| 摘要 |
PROBLEM TO BE SOLVED: To provide a key information buildup method, a key updating system, a key management apparatus, and a communication terminal in a multihop network. SOLUTION: In the multihop network, including an authentication management apparatus 100 for managing keys in a hierarchical structure and a plurality of communication terminals for acquiring keys, the key updating system is such that the system builds up key information with a hierarchical structure in matching with the multihop network structure; the authentication management apparatus 100 determines an encryption key for encrypting the key, on the basis of the key information and the communication terminals 110 acquire the key; the authentication management apparatus 100 includes a key tree management section for building up and managing the key information; an encryption section for encrypting the key, by using a key in the key information; and a transmission section for transmitting the key encrypted by the encryption section, and each communication terminal 100 includes a receiving section for receiving the encrypted key; a key management section for managing the key that should be stored by itself; and a decoding section for decoding the encrypted key. COPYRIGHT: (C)2007,JPO&INPIT
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