Communication system, communication device, and communication method
First Claim
1. A communication system comprising at least two communication devices for performing wireless communication,wherein one communication device of said two communication devices comprises a circuit for performing control so that a signal indicating that predetermined information is valid is transmitted to an other communication device when the predetermined information is transmitted from said one communication device to said other communication device by wireless,wherein said other communication device comprises a circuit for determining whether received information is valid based on the signal indicating that the information is valid upon receipt of the information transmitted from said one communication device by wireless, andwherein a potential of a medium that transmits said signal is set to an inactive state except while an encryption key is delivered by wireless.
3 Assignments
0 Petitions
Accused Products
Abstract
One and the other communication terminals for performing wireless communication are connected by a cable. The one communication terminal performs control so that an encryption key is transmitted from the one communication terminal to the other communication terminal by wireless during a period in which the potential of the cable is active. The other communication terminal stores the encryption key received from the one communication terminal within the period in which the potential of the cable is active, as a valid key, for use in subsequent encryption processing.
45 Citations
23 Claims
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1. A communication system comprising at least two communication devices for performing wireless communication,
wherein one communication device of said two communication devices comprises a circuit for performing control so that a signal indicating that predetermined information is valid is transmitted to an other communication device when the predetermined information is transmitted from said one communication device to said other communication device by wireless, wherein said other communication device comprises a circuit for determining whether received information is valid based on the signal indicating that the information is valid upon receipt of the information transmitted from said one communication device by wireless, and wherein a potential of a medium that transmits said signal is set to an inactive state except while an encryption key is delivered by wireless.
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10. A communication system comprising:
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at least two communication devices for performing communication by wireless; and a cable for establishing connection between a predetermined terminal of one communication device of said two communication devices and a predetermined terminal of an other communication device of said two communication devices, wherein said one communication device comprises a circuit for performing control so that a potential of said cable is set to an active state from an inactive state when transmitting an encryption key to said other communication device by wireless and a potential of said cable is set to an inactive state after a completion of the wireless transmission of said encryption key, and wherein said other communication device comprises a circuit for determining said encryption key received from said one communication device within a period during which the potential of said cable is in the active state to be a valid encryption key, and storing said encryption key in a storage unit of said other communication device.
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11. A method of performing wireless communication between at least two communication devices, said method comprising:
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transmitting by one communication device of said two communication devices a signal indicating that predetermined information is valid to an other communication device when transmitting the predetermined information from said one communication device to said other communication device by wireless; and determining whether received information is valid based on a signal indicating that the information is valid upon receipt of the information transmitted from said one communication device by wireless, by said other communication device, wherein a potential of a medium that transmits said signal is set to an inactive state except while an encryption key is delivered by wireless. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A communication method comprising:
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establishing connection between one communication device and an other communication device by a cable; setting a potential of said cable to an active state from an inactive state when transmitting an encryption key to said other communication device by wireless, and setting the potential of said cable to an inactive state after completion of the wireless transmission of said encryption key, by said one communication device; and determining said encryption key received from said one communication device within a period during which the potential of said cable is in the active state to be a valid encryption key, and storing said encryption key in a storage unit of said other communication device, by said other communication device. - View Dependent Claims (21)
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22. A communication device comprising:
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an antenna; a control terminal connected to a control terminal of a device of a communication party through an electrical connecting member; a circuit for delivering an encryption key by wireless to said device of said communication party through said antenna; and a circuit for setting a potential at said control terminal to an active state while delivering said encryption key to said device of said communication party by wireless and then setting the potential at said control terminal to an inactive state after delivering said encryption key to said device of said communication party by wireless.
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23. A communication device comprising:
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an antenna; a control terminal for receiving a control signal; a circuit for decoding an encryption key transmitted from a device of a communication party by wireless and received through said antenna; and a circuit for determining whether said received encryption key has been received in a period during which the potential at said control terminal is an active state and performing control so that said received encryption key is stored in a holding circuit thereof as a valid encryption key when said encryption key is determined to have been received in a period during which the potential at said control terminal is in the active state.
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Specification