| 摘要 |
PURPOSE: A relay attack prevention method of a smart key system is provided to prevent the robbery possibility of articles in a vehicle in advance by using a FOB key. CONSTITUTION: A challenge signal reception step (S10) receives a signal by using a FOB key. A first decoding step (S20) decodes the level difference of RSSI in the received challenge signal. A response signal transmission step (S30) transmits a response signal to a smart key unit when the level difference of the analyzed RSSI is matched with a set value. A second decoding step (S40) decodes the response signal received by the smart key unit. A normal user determination step determining the state of a passive operation signal applied from the door of a vehicle. [Reference numerals] (AA) Start; (BB) Response signal transmission step; (CC) RSSI level difference = a predetermined value ?; (DD,JJ) No; (EE,II) Yes; (FF) Response signal transmission; (GG) Normal user determination step; (HH) Encoding code identical ?; (KK) SMK unit operation signal applying; (LL) End; (S10) Challenge signal reception step; (S20) First decoding step; (S40) Second decoding step |
