| 摘要 |
PROBLEM TO BE SOLVED: To prevent a password from being easily seen through and also to cause no lock state of password input function by increasing the length of the cycle of occurrence of trigger signals in response to the non-coincidence frequency of collation results. SOLUTION: This system includes a continuous error count part 8 which counts the continuous non-coincidence frequency of collation results obtained at a collation part 3, an enabling signal occurrence interval calculation part 9 which controls the occurrence interval of enabling signals 100 in response to the count value of the part 8, and a signal generation part 10 which is controlled by the part 9 and varies the occurrence interval of signals 100. In such a constitution, the collation timing and the permission timing are increased according to the non-coincidence frequency of password collation results. Therefore, no coincidence of password is detected despite the input of all conceivable passwords and the passwords are never easily broken. Furthermore, the system lock state can be canceled with input of a correct password. |
