ILLICIT COMMUNICATION ESTABLISHMENT PREVENTION SYSTEM AND ILLICIT COMMUNICATION ESTABLISHMENT PREVENTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an illicit communication establishment prevention system and illicit communication establishment prevention method that can prevent illicit communication from being established without requiring major modifications.;SOLUTION: A first communication unit 18 on the vehicle side LF-transmits a challenge code for challenge-response authentication when smart verifying. At this time, measuring the distance between a vehicle and electronic key is performed during time Ts after the challenge code is transmitted until the response code is responded. Therefore, a UWB radio wave Sa is transmitted and received during the time Ts, and a measured distance value is calculated. A first communication unit 20 on the terminal side UHF-transmits a response code if the measured distance value is appropriate in order to perform challenge-response authentication. Meanwhile, the first communication unit 20 on the terminal side does not transmit a response code and terminates smart communication if the measure distance value is not appropriate.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2020,JPO&INPIT