| 摘要 |
PROBLEM TO BE SOLVED: To improve the prediction accuracy of authentication time in time authentication.SOLUTION: An authentication management device 100 is connected through a network to a user terminal 104 and an authentication station 106. The authentication management device 100 calculates authentication scheduled time before time authentication, to add the description of authentication scheduled time information 110 to a first electronic file 108. The authentication management device 100 transmits hash information 114 to the authentication station 106. Then the authentication station 106 returns a token 118 which includes an authentication time entry 116. When a time difference between the authentication scheduled time and the authentication time is a permitted threshold or smaller, the authentication scheduled time is authenticated. When the time difference is larger than the permitted threshold, the authentication scheduled time is calculated again on the basis of an adjusted value so as to reduce the time difference, and when a predetermined change condition is held, the adjusted value is changed also. |
