Authenticating method for short-distance radio devices and a short-distance radio device
First Claim
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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Abstract
The invention provides a method for making mutual authentication between short-distance radio devices automatically or after confirmation by users, and a short-distance radio device for realizing the method. In a condition where a plurality of radio devices exist, each of the radio devices comprising a data communicating unit for performing short-distance radio communication and an authenticating unit for performing authentication of the radio device, the authenticating unit performs mutual authentication between two radio devices automatically or after confirmation by users of the radio devices when the two radio devices come closer to each other to such an extent that coverage areas of radio waves generated by the radio devices overlap with each other.
25 Citations
15 Claims
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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. - View Dependent Claims (2, 3, 4)
- 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;
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5. An authenticating method for radio devices, comprising:
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switching coverage area of a radio device, 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 radio devices having the second coverage area to within a proximity of one another so that the coverage areas of the radio devices overlap; and performing mutual authentication between the radio devices automatically when the coverage area of the radio devices overlap, wherein a transmission output of only a particular one of the radio devices is reduced to shorten a communication distance of the radio devices.
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6. An authenticating method for radio devices, comprising:
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switching coverage area of a radio device, 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 radio devices having the second coverage area to within a proximity of one another so that the coverage areas of the radio devices overlap; and performing mutual authentication between the radio devices automatically when the coverage area of the radio devices overlap, wherein a reception sensitivity of only a particular one of the radio devices is reduced to shorten a communication distance of the radio devices. - View Dependent Claims (7)
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8. A radio device comprising:
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data communicating means for performing radio communication over a first coverage area; authenticating means for performing authentication over a second coverage area; and switching means for switching the coverage area of the radio device, prior to initiating authentication with a second radio device, from the first coverage area to the second coverage area, the second coverage area being smaller than the first coverage area; wherein the authenticating means initiates mutual authentication with the second radio device based only on the bringing of the radio devices to within a proximity such that the coverage areas of the radio devices overlap; and wherein the authenticating means performs mutual authentication between the radio devices automatically when the radio devices are brought in proximity to one another so that the second coverage areas overlap. - View Dependent Claims (9, 10)
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11. A radio device comprising:
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data communicating means for performing radio communication over a first coverage area; authenticating means for performing authentication over a second coverage area; and switching means for switching the coverage area of the radio device, prior to initiating authentication with a second radio device, from the first coverage area to the second coverage area, the second coverage area being smaller than the first coverage area; wherein the authenticating means performs, in a condition where the radio devices exist, mutual authentication between the radio devices automatically when the radio devices are brought in proximity to one another so that the second coverage areas overlap, and wherein a transmission output of only a particular one of the radio devices is reduced to shorten communication distance of the radio devices. - View Dependent Claims (12)
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13. A radio device comprising:
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data communicating means for performing radio communication over a first coverage area; authenticating means for performing authentication over a second coverage area; and switching means for switching the coverage area of the radio device, prior to initiating authentication with a second radio device, from the first coverage area to the second coverage area, the second coverage area being smaller than the first coverage area; wherein the authenticating means performs, in a condition where the radio devices exist, mutual authentication between the radio devices automatically when the radio devices are brought in proximity to one another so that the second coverage areas overlap, and wherein a reception sensitivity of only a particular one of the radio devices is reduced to shorten communication distance of the radio devices. - View Dependent Claims (14)
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15. An authenticating method for radio devices, comprising the steps of:
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providing a plurality of radio devices; reducing, prior to initiating authentication, the coverage areas of the radio devices; initiating mutual authentication by establishing communication between the radio devices based only on the bringing of the radio devices to within a proximity such that the coverage areas of radio waves generated by the radio devices overlap; and
performing mutual authentication between the radio devices automatically when the radio devices come sufficiently close to each other that coverage areas of radio waves generated by the radio devices overlap.
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Specification