| 摘要 |
PROBLEM TO BE SOLVED: To reliably prevent a fraudulent act.SOLUTION: A bit value in a bit number [4-3] of security time setting KSES is set to a value other than "00", thus setting variable setting time that changes within a predetermined time range. A bit value in a bit number [2-0] of security time setting KSES is set to a value other than "000", thus setting one of a plurality of pieces of extension time selectable in advance in addition to fixed time. By setting a bit value in a bit number [1-0] of second random number initial setting KRS2 to "01", a start value setting circuit 554 of a random number circuit 509 sets a start value in a count value generated by a random number generation circuit 553 to a value changed at each system reset as a start value of numerical data generated by a random number generation circuit 553. |
