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Wireless communications system

  • US 9,392,448 B2
  • Filed: 01/18/2013
  • Issued: 07/12/2016
  • Est. Priority Date: 01/31/2012
  • Status: Active Grant
First Claim
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1. A radio communication system, comprising:

  • a portable device; and

    a communication subject that includes a controller, whereinthe portable device and the controller of the communication subject are configured to periodically perform verification to verify the portable device, and to perform exchange of an information signal, which includes information differing from that of the verification, between the portable device and the communication subject;

    the exchange of the information signal is performed during a period between periodic performances of the verification;

    the portable device and the communication subject hold the same encryption key, and the verification performed between the portable device and the controller of the communication subject uses the encryption key;

    the controller stores identification information, which is unique to the communication subject, and key generation logic, which is used to generate the encryption key;

    the portable device stores the encryption key and an encryption key generation code, which is unique to the portable device;

    the key generation logic and encryption key generation code are used to generate the encryption key;

    the controller is configured to perform a registration process comprising;

    writing the identification information to the portable device through radio communication with the portable device;

    retrieving the encryption key generation code from the portable device through radio communication with the portable device;

    generating an encryption key that is the same as the encryption key of the portable device from the retrieved key generation code using the key generation logic stored in the controller, andstoring the generated encryption key in the controller;

    wherein the controller is configured to transmit, to the portable device, a deletion request signal, which requests deletion of the encryption key generation code and serves as the information signal during a period between performances of the verification; and

    wherein the portable device is configured to delete the encryption key generation code from the portable device when the deletion request signal is retrieved.

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