| 摘要 |
An authentication system has a server system provided with a common authentication unit (i.e., first and second authentication units) and a system controller (i.e., an access-permitting unit). The first authentication unit authenticates user-identifying information transmitted from a communication terminal and generates an access key based on the user-identifying information. The access key is transmitted from the server system to the communication terminal. The second authentication unit authenticates the access key transmitted from the communication terminal and generates a cession key to access the data. The access key is transmitted from the server system to the communication terminal. The access permitting unit permits the data to be accessed within a predetermined period of time. The access is performed on the session key transmitted from the communication terminal.
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