| 摘要 |
PROBLEM TO BE SOLVED: To provide an authentication key system, an electronic key system and a remote control operation key system that can solve the problem of an ID and a password being used for authentication of a communication unit and of its user of being possibly plagiarized. SOLUTION: In the case of communication from a communication terminal, such as a personal computer 5 or a mobile phone 6 to a communication unit of a bank/ card company 7 or a supplyer 8 via a wireless base station 2, a telephone line 1 and the Internet 3, a SAW device AD in switching operation only with a specific code is used for an authentication key to identify a communication terminal or a communication unit or its user, and the communication is enabled by the transmission of the specific code to the communication terminal or the communication unit provided with the SAW device. The authentication system includes a system, wherein the SAW device is used for a lock for a cargo, an automobile and an exit/ entrance door of a building, and a system wherein a device is used for a remote control operation switch that conducts remote on/off operation control. |
