| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an authentication system of high security capable of detecting and excluding an illegal access due to the illegal use of a transmitting and address or a password. SOLUTION: Plural passwords (or plural password generation algorithm elements) and set information are stored in a connection device 1 and a terminal 2. The time of the device 1 is synchronized with that of the terminal 2 and a password (or password generation algorithm) is changed with the lapse of time on the basis of the set information. The terminal 2 adds the password to a frame to be transmitted and transmits the frame and the device 1 compares the password of the received frame with the password of the device 1. When both the passwords coincide with each other, the device 1 permits the communication of the terminal 2, and when the passwords are different from each other, inhibits the communication and cancels the frame.</p> |
