DEVICE AND METHOD FOR NEAR FIELD COMMUNICATIONS USING AUDIO TRANSDUCERS
First Claim
1. A method for establishing a secure wireless communication link between first and second proximately-located devices, each of which includes respective audio transmitters and audio receivers, the method comprising:
- using the audio transmitter of the first device to transmit a device-dependent authentication key;
receiving the transmitted authentication key at the audio receiver of the second device, and using the audio transmitter of the second device to transmit an acknowledgement;
receiving the acknowledgement at the audio receiver of the first device;
determining the round-trip time from transmitting the authentication key from the first device to receiving the acknowledgement at the first device; and
determining whether to establish the secure wireless communication link based on the determined round-trip time.
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Accused Products
Abstract
Secure wireless communication links are established between proximately-located devices, each of which includes respective audio transmitters and audio receivers. The audio transmitter of the first device can be used to transmit a device-dependent authentication key, which is received by the audio receiver of the second device. The audio transmitter of the second device can be used to transmit an acknowledgement, which is received at the audio receiver of the first device. The round-trip time from transmitting the authentication key from the first device to receiving the acknowledgement at the first device can be determined, and the decision of whether to establish the secure wireless communication link can be based on the determined round-trip time. In certain embodiments, these steps can be repeated starting with the second device to establish a two-way trust between the devices.
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Citations
16 Claims
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1. A method for establishing a secure wireless communication link between first and second proximately-located devices, each of which includes respective audio transmitters and audio receivers, the method comprising:
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using the audio transmitter of the first device to transmit a device-dependent authentication key; receiving the transmitted authentication key at the audio receiver of the second device, and using the audio transmitter of the second device to transmit an acknowledgement; receiving the acknowledgement at the audio receiver of the first device; determining the round-trip time from transmitting the authentication key from the first device to receiving the acknowledgement at the first device; and determining whether to establish the secure wireless communication link based on the determined round-trip time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A mobile communications device comprising:
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an audio transmitter; an audio receiver; circuitry adapted to send audio data packets via the audio transmitter, receive audio data packets via the audio receiver, calculate round-trip times between sending audio data packets and receiving audio acknowledgements, and validate audio communications based on the calculated round-trip times. - View Dependent Claims (13, 14, 15)
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16. A method for use with a mobile communications device having an audio transmitter, an audio receiver, and a processor adapted to send audio data packets via the audio transmitter and receive audio data packets via the audio receiver, the method comprising adapting the mobile communications device to establish secure communication links by:
storing a program in a memory location of the mobile communications device, the program being executable by the processor to calculate round-trip times between sending audio data packets and receiving audio acknowledgements, and to validate audio communications based on the calculated round-trip times.
Specification