| 摘要 |
PURPOSE:To prevent an illegal access by stopping the subsequent procedure unless the following input password number is right to the 2nd password number in case the given password number is not right to the 1st password number. CONSTITUTION:It is decided whether an external password signal 117 is right or not to the 1st password number X1 registered to the 1st password number storing means 111. If the signal 117 is right as a password number, an access control means 123 permits an access to an information storing means 115 via an external access signal 121. If the signal 117 is not right to the number X1, it is decided whether the following password number is right or not to the 2nd password number X2 registered to the 2nd password number storing means 113. Based on the result of this decision, the subsequent procedure is permitted or the control is carried out to secure the prescribed state. The access is impossible even if only the 1st password number is varied. Thus an illegal access can be completely prevented. |
