| 摘要 |
PROBLEM TO BE SOLVED: To improve a security level for log-in by setting up a mask table for specifying whether the input of user ID and a password are to be permitted or not and executing double check for input permission while using original user ID and password. SOLUTION: At the time of receiving log-in requests from client terminals 20, 30 through a communication device 15, a CPU 11 executes log-in receiving processing, collates user authentication data (user names and passwords) received together with the log-in requests with user authentication information stored in a user authentication information mask table 16a stored in an HD device 16, and when there is information coincident with the received data, acquires a mask condition stored correspondingly to the user authentication information. When the date of the log-in request is not included in the period of the mask condition (from the start date of a period disabling user authentication to the end date), a log-in to a server 10 concerned is permitted and a system is started. |
