| 摘要 |
PROBLEM TO BE SOLVED: To improve security in a public key book management technology, by which an authentication device authenticates each public key, and a public key book management device stores and opens a public key book in which each public key is associated with each authentication result. SOLUTION: A user device transmits the public key to the public key book management device, further transmits first key sharing information which is encryption information for sharing key information between the user device and the public key book management device to the public key book management device to share a common key. After that, a signature generation part of the user device uses a private key corresponding to the public key transmitted in a public key transmission process, generates signature information to information including the first key sharing information, and a signature information verification part of the public key book management device uses the public key transmitted in the public key transmission process to verify the signature information. After that, authentication processing is performed between the user device and the authentication device using the shared common key between the devices, and the public key book management device further uses the common key, and extracts its authentication result to generate a public key book. COPYRIGHT: (C)2009,JPO&INPIT
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