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Authenticating method for short-distance radio devices and a short-distance radio device

  • US 7,739,503 B2
  • Filed: 12/17/2007
  • Issued: 06/15/2010
  • Est. Priority Date: 08/04/2000
  • Status: Expired due to Fees
First Claim
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1. An authenticating method for radio devices, comprising:

  • switching coverage area of two of the radio devices, prior to initiating authentication between the radio devices, from the first coverage area to the second coverage area, the second coverage area being smaller than the first coverage area;

    bringing, prior to initiating authentication between the radio devices, the two radio devices having the second coverage area to within a proximity of one another so that the coverage areas of the radio devices overlap;

    initiating mutual authentication by establishing communication between the radio devices based only on the bringing of the two radio devices to within the proximity; and

    performing mutual authentication between the radio devices automatically when the coverage area of the two radio devices overlap.

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