Systems and methods for providing opportunistic security for physical communication channels
First Claim
1. A method for opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel, the method comprising:
- transmitting, in a first time period in which signal quality on the main channel is better than signal quality on the eavesdropper channel, symbols that are randomly selected from a set of symbols;
transmitting, in a second time period in which signal quality on the main channel is not better than signal quality on the eavesdropper channel, coding information associated with the randomly selected symbols;
reconciling the randomly selected symbols using the coding information;
determining when signal quality on the main channel is better than signal quality on the eavesdropper channel;
responsive to the determination, transmitting the symbols that are randomly selected from a set of symbols;
determining when signal quality on the main channel is not better than signal quality on the eavesdropper channel; and
responsive to the determination, transmitting the coding information associated with the randomly selected symbols.
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Abstract
Systems and methods of providing opportunistic security for physical communication channels are disclosed. One disclosed method is for opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel. This example method includes transmitting, in a first time period in which signal quality on the main channel is better than signal quality on the eavesdropper channel, symbols that are randomly selected from a set of symbols. The method also includes transmitting, in a second time period in which signal quality on the main channel is not better than signal quality on the eavesdropper channel, coding information associated with the randomly selected symbols. The method also includes reconciling the randomly selected symbols using the coding information.
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Citations
24 Claims
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1. A method for opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel, the method comprising:
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transmitting, in a first time period in which signal quality on the main channel is better than signal quality on the eavesdropper channel, symbols that are randomly selected from a set of symbols; transmitting, in a second time period in which signal quality on the main channel is not better than signal quality on the eavesdropper channel, coding information associated with the randomly selected symbols; reconciling the randomly selected symbols using the coding information; determining when signal quality on the main channel is better than signal quality on the eavesdropper channel; responsive to the determination, transmitting the symbols that are randomly selected from a set of symbols; determining when signal quality on the main channel is not better than signal quality on the eavesdropper channel; and responsive to the determination, transmitting the coding information associated with the randomly selected symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system of opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel, the system comprising:
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transmitting, in a first time period in which signal quality on the main channel is better than signal quality on the eavesdropper channel, symbols that are randomly selected from a set of symbols; transmitting, in a second time period in which signal quality on the main channel is not better than signal quality on the eavesdropper channel, coding information associated with the randomly selected symbols; reconciling the randomly selected symbols using the coding information; determining when signal quality on the main channel is better than signal quality on the eavesdropper channel; responsive to the determination, transmitting the symbols that are randomly selected from a set of symbols; determining when signal quality on the main channel is not better than signal quality on the eavesdropper channel; and responsive to the determination, transmitting the coding information associated with the randomly selected symbols.
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13. A method for opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel, the method comprising:
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transmitting, in a first time period, symbols that are randomly selected from a set of symbols; transmitting, in a second time period, coding information associated with the randomly selected symbols; reconciling the randomly selected symbols using the coding information, wherein the first and second time periods are distinguished by relative signal quality on the main channel and on the eavesdropper channel; determining when signal quality on the main channel is better than signal quality on the eavesdropper channel; responsive to the determination, transmitting the symbols that are randomly selected from a set of symbols; determining when signal quality on the main channel is not better than signal quality on the eavesdropper channel; and responsive to the determination, transmitting the coding information associated with the randomly selected symbols. - View Dependent Claims (14, 15, 16, 17)
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18. A system for opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel, the system comprising:
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a physical layer component configured to distill a key from symbols and coding information that are presented on the main channel during two different time periods, the two different time periods distinguished by relative signal quality on the main channel and on the eavesdropper channel; a higher-than-physical-layer component configured to encrypt a message using the distilled key; transmitting, in the first time period, symbols that are randomly selected from a set of symbols; transmitting, in the second time period, coding information associated with the randomly selected symbols; and reconciling the randomly selected symbols using the coding information. - View Dependent Claims (19, 20)
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21. A system for opportunistic secure communication on a main channel between a sender device and a receiver device when an eavesdropper device is listening on an eavesdropper channel, the system comprising:
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a physical layer component configured to generate a first key in a first generation period and to generate a second key during a second generation period; a higher-than-physical-layer component configured to encrypt in a first encryption period with the first key and to encrypt in a second encryption period with the second key, wherein the physical layer component is further configured to generate each of the first and the second keys from symbols and coding information that are presented on the main channel during two different sub-periods contained within the respective generation periods, the two different sub-periods distinguished by relative signal quality on the main channel and on the eavesdropper channel; transmit, in the first sub-period, symbols that are randomly selected from a set of symbols; transmit, in the second sub-period, coding information associated with the randomly selected symbols; and reconcile the randomly selected symbols using the coding information. - View Dependent Claims (22, 23, 24)
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Specification