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One-way key fob and vehicle pairing verification, retention, and revocation

  • US 9,698,980 B2
  • Filed: 04/04/2016
  • Issued: 07/04/2017
  • Est. Priority Date: 08/30/2012
  • Status: Active Grant
First Claim
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1. A key fob device, comprising:

  • a transmitter configured to transmit signals to a control unit;

    a memory configured to store a key fob counter and an operation key (OpKey); and

    a processor coupled to the transmitter and memory, the processor configured to;

    generate an AES-128 OpKey-encrypted value of the key fob counter;

    transmit to the control unit a message including a predetermined number of lowest-order bits of the key fob counter and a predetermined number of bits of the AES-128 OpKey-encrypted value of the key fob counter;

    transmit to the control unit a command to enter a revocation mode, wherein OpKeys associated with key fob devices that operate during a revocation mode period following entering the revocation mode are retained by the control unit and all other OpKeys associated with key fob devices that do not perform an operation during the revocation mode period are deleted from the control unit.

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