Electromagnetic wave communication system, apparatus, method and program
First Claim
1. A communication apparatus comprising:
- a carrier wave generator configured to generate a first electromagnetic wave using an antenna;
a modulator configured to modulate the first electromagnetic wave for transmitting a first message to an external communication device;
a load modulator configured to modulate a second electromagnetic wave generated by the external communication device for transmitting a second message to the external communication device; and
a controller configured to cause the communication apparatus to;
transmit the first message when the second electromagnetic wave is not detected and,transmit the second message when the second electromagnetic wave is detected,wherein the first message is a first inquiry for identification information of the external communication device,wherein the communication apparatus is configured to receive a first response in response to the first inquiry, the first response including a first random number,wherein the second message includes a second response associated with a second inquiry for identification information of the communication apparatus, andwherein as a result of the communication apparatus transmitting the first message or the second message, mutual authentication is executed between the communication apparatus and the external communication device.
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Abstract
A communication apparatus is provided and including a carrier wave generator configured to generate a first electromagnetic wave; a modulator configured to modulate the first electromagnetic wave for transmitting a first message to a first communication device; a load modulator configured to modulate a second electromagnetic wave generated by the first communication device for transmitting a second message to the first communication device; a controller configured to control the communication apparatus to: transmit the first message when the second electromagnetic wave is not detected and, transmit the second message when the second electromagnetic wave is detected. A communication method is also provided.
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Citations
20 Claims
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1. A communication apparatus comprising:
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a carrier wave generator configured to generate a first electromagnetic wave using an antenna; a modulator configured to modulate the first electromagnetic wave for transmitting a first message to an external communication device; a load modulator configured to modulate a second electromagnetic wave generated by the external communication device for transmitting a second message to the external communication device; and a controller configured to cause the communication apparatus to; transmit the first message when the second electromagnetic wave is not detected and, transmit the second message when the second electromagnetic wave is detected, wherein the first message is a first inquiry for identification information of the external communication device, wherein the communication apparatus is configured to receive a first response in response to the first inquiry, the first response including a first random number, wherein the second message includes a second response associated with a second inquiry for identification information of the communication apparatus, and wherein as a result of the communication apparatus transmitting the first message or the second message, mutual authentication is executed between the communication apparatus and the external communication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16, 17)
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8. A communication method for a communication apparatus, the communication method comprising:
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generating a first electromagnetic wave by a carrier wave generator using an antenna; modulating the first electromagnetic wave for transmitting a first message to an external communication device by a modulator, wherein the first message is a first inquiry for identification information of the external communication device; modulating, by a load modulator, a second electromagnetic wave generated by the external communication device for transmitting a second message to the external communication device; transmitting the first message when the second electromagnetic wave is not detected; and transmitting the second message when the second electromagnetic wave is detected, wherein the second message includes a second response associated with a second inquiry for identification information of the communication apparatus; receiving a first response in response to the first inquiry, the first response including a first random number; and executing, as a result of transmitting the first message or the second message, mutual authentication between the communication apparatus and the external communication device. - View Dependent Claims (9, 10, 11, 12, 13, 14, 18, 19, 20)
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Specification