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METHOD FOR PREVENTING RELAY-ATTACK ON SMART KEY SYSTEM

  • US 20150074805A1
  • Filed: 10/25/2012
  • Published: 03/12/2015
  • Est. Priority Date: 04/17/2012
  • Status: Active Grant
First Claim
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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.

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