METHOD FOR PREVENTING RELAY-ATTACK ON SMART KEY SYSTEM

摘要

The present invention relates to a method for preventing a relay-attack on a smart key system, and in particular, provides an advantage of preventing a vehicle and equipment stored inside the vehicle from being stolen by using predetermined information transmitted and received when the SMK UNIT of the vehicle and a FOB Key wirelessly communicate with each other and enabling a holder of the FOB Key to make the relay-attack once the holder secures visibility from the vehicle.

主权项

1. A method for preventing relay-attack on a smart key system, the method comprising:
a challenge signal receiving step of transmitting a challenge signal including received signal strength information (hereinafter, “RSSI”) information of two levels from a smart key unit (hereinafter, “SMK unit”) installed in a vehicle to a FOB key carried by a user and receiving the challenge signal by the FOB key; a first decoding step of decoding at least one information item of information items included in the challenge signal after receiving the challenge signal; a response signal transmitting step of transmitting a response signal from the FOB key to the SMK unit after the first decoding step; a second decoding step of decoding at least any one information item included in the response signal received by the SMK unit after the response signal transmitting step; and a normal user determining step of calculating a current distance between the vehicle and the FOB key using a result interpreted in the second decoding step and determining whether a passive operation signal applied from a door of the vehicle other than the FOB key is normal.