Birch, Stewart, Kolasch & Birch, LLP
Method for preventing relay attack on vehicle smart key system
A method for preventing a relay attack of a smart key system for a vehicle according to the present invention accurately calculates a current spaced distance between an SMK unit and a fob key by using an RSSI included in a response signal and a current voltage level in a process of decoding the response signal when the fob key carried by a user receives a signal applied from the SMK unit installed in a vehicle and then transmits the response signal having at least two kinds of information to the SMK unit, and detects a challenge signal applied from the SMK unit installed in the vehicle and a noise signal included in the response signal, thereby enabling an operation of the vehicle only in a state where the carrier of the fob key secures a predetermined visual distance from the vehicle, and more definitely preventing a third party from breaking into the vehicle through RF bi-directional authentication.
SEOYON ELECTRONICS CO., LTD.
G G B H B B H H G B
G07C G07C B60R H04L B60R B60R H04W H04W G07C B60R
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Shim Soo Ju Min Gyu Ho
Kim Kim Kim