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Bluetooth low energy (BLE) passive vehicle access control system for defending the system against relay attacks and method thereof

  • US 10,124,768 B1
  • Filed: 05/09/2017
  • Issued: 11/13/2018
  • Est. Priority Date: 05/09/2017
  • Status: Active Grant
First Claim
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1. A Bluetooth Low Energy (BLE) passive vehicle access control system comprising:

  • a vehicle comprising;

    a first radio transceiver; and

    an electromagnet configured to generate an electromagnetic field with a varying intensity level based on a randomly generated key, the electromagnet being separate from the first radio transceiver; and

    an external device comprising;

    a second radio transceiver configured to transmit and receive encrypted data with the first radio transceiver in the vehicle;

    a magnetometer, the magnetometer being separate from the second radio transceiver; and

    a processor coupled to the first radio transceiver and the magnetometer, the processor being configured to;

    generate a fingerprint of an electromagnetic field in a region proximate to the external device based on measurements made using the magnetometer;

    transmit the fingerprint to the first radio transceiver in a first encrypted packet using a secret magnetic key to encrypt the fingerprint;

    identify that a second encrypted packet received with the second radio transceiver is transmitted from the first radio transceiver in the vehicle only in response to the second encrypted packet including the fingerprint; and

    disable communication of the second radio transceiver in response to the second encrypted packet not including the fingerprint.

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