| 摘要 |
A user authenticating system includes a certification authority for issuing a certification to a user who desires to use a bulletin board system. The certification is obtained by enciphering original information including at least information identifying the user using a secret key. A computer is; provided in the bulletin board system. For authenticating the user based on the certification. The computer has a deciphering unit for deciphering the certification using a public key so as to obtain the original information and a determining knit for determining based on the original information obtained by the deciphering unit whether the user is a regular user. A result obtained by the determination unit, used to authenticate the user. A user support computer is provided in the bulletin board system for supplying, based on operations of the user, the certification issued by the certification authority to the computer for authenticating the user.
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