CRYPTOGRAPHIC KEY EXCHANGE OVER AN ELECTROSTATIC CHANNEL
First Claim
1. An interactive display device comprising:
- a touch sensor including an electrode matrix having row electrodes and column electrodes, where the interactive display device is configured to excite one or more electrodes of the electrode matrix to form a capacitive coupling to capacitively send a cryptographic key via an electrostatic channel; and
a radio transceiver configured to communicate via a radio channel, where the interactive communication device is configured to subsequently exchange encrypted communications over the radio channel, the encrypted communications being encrypted using the cryptographic key.
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Abstract
Various embodiments relating to exchanging a cryptographic key between a display device and an input device via electrostatic communication are disclosed. In one embodiment, an interactive communication device includes one or more electrodes and a radio transceiver. The one or more electrodes may be excited to capacitively couple with one or more electrodes of a proximate communication device so as to capacitively send a cryptographic key from the interactive communication device to the proximate communication device. The radio transceiver may be configured to communicate with a radio transceiver of the proximate communication device via a radio channel. The interactive communication device may be configured to subsequently exchange encrypted communications with the proximate communication device over the radio channel. The encrypted communications may be encrypted using the cryptographic key.
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Citations
20 Claims
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1. An interactive display device comprising:
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a touch sensor including an electrode matrix having row electrodes and column electrodes, where the interactive display device is configured to excite one or more electrodes of the electrode matrix to form a capacitive coupling to capacitively send a cryptographic key via an electrostatic channel; and a radio transceiver configured to communicate via a radio channel, where the interactive communication device is configured to subsequently exchange encrypted communications over the radio channel, the encrypted communications being encrypted using the cryptographic key. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An input device configured to interact with an interactive display device, the input device comprising:
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an electrode tip configured to be excited to form a capacitive coupling to capacitively send a cryptographic key via an electrostatic channel; and a radio transceiver configured to communicate via a radio channel, where the input device is configured to subsequently exchange encrypted communications over the radio channel, the encrypted communications being encrypted using the cryptographic key. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for transmitting information between a first communication device and a second communication device, the method comprising:
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sending a symmetric cryptographic key from the first communication device to the second communication device via capacitive coupling of one or more electrodes of the first communication device and one or more electrodes of the second communication device; and subsequently exchanging encrypted communications with the second communication device over a radio channel formed between a first radio transceiver of the first communication device and a second radio transceiver of the second communication device, the encrypted communications being encrypted using the symmetric cryptographic key. - View Dependent Claims (18, 19, 20)
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Specification