| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe secret information updating method between nodes which has a small operation quantity. SOLUTION: First, a terminal device operates a hash function H(1) using random numbers generated in a server and the secret information of the terminal device and transmits a result of operation to the server, the server operates a hash function H(2) using the random numbers generated in the server and the secret information of the terminal device to be stored in the server, and the server confirms that the result of operation of the hash function H(1) is equal to the result of operation of the has function H(2). Subsequently, the server transmits new secret information and blind information generated using the new secret information and the present secret information to the terminal device. Further, the server substitutes the new secret information for the present secret information. The terminal device having received the blind information acquires the new secret information generated in the server using the blind information and the present information of the terminal device, and substitutes the new secret information for the present secret information of the terminal device. COPYRIGHT: (C)2007,JPO&INPIT
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