METHOD FOR PREVENTING RELAY ATTACK ON VEHICLE SMART KEY SYSTEM

摘要

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.

主权项

1. A method for preventing a relay attack of a smart key system for a vehicle, comprising:
a challenge signal receiving operation of receiving, by a fob key carried by a user, a challenge signal applied from a smart key unit (hereinafter, referred to as an “SMK unit”) installed in a vehicle; a response signal transmitting operation of transmitting, by the fob key, a response signal including an encoding code to the SMK unit after the challenge signal receiving operation; a response signal receiving operation of receiving, by the SMK unit, the response signal after the response signal transmitting operation; a first attack signal detecting operation of detecting a noise signal included in the response signal received by the SMK unit after the response signal receiving operation; and a functional operation unit operation controlling operation of controlling operations of various functional operation units installed in the vehicle according to a decoding result by the first attack signal detecting operation.