| 摘要 |
PROBLEM TO BE SOLVED: To transfer authority of encryption communication without increasing leakage risk of an encryption key. SOLUTION: A system with a first communication apparatus and a management apparatus which makes encryption communications perform between the first communication apparatus and an external second communication apparatus, is offered. The management apparatus is provided with: a key memory unit which memorizes a first encryption key which is shared with the second communication apparatus; a key creation unit which performs operation which gives the first encryption key which is read out from the key memory unit to one direction function with a key, and creates the operation result as the second encryption key; and a key output unit which outputs the second encryption key and the key of the one direction function to the first communication apparatus. The first communication apparatus is provided with a key creation control unit which transmits the key of the one direction function received from the management apparatus to the second communication apparatus, makes the second communication apparatus perform operation to give the memorized first encryption key to the one direction function with the key, and creates the second encryption key; and an encryption communication unit which performs encryption communications with the second communication apparatus using the second encryption key received from the management apparatus. COPYRIGHT: (C)2008,JPO&INPIT
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