Secure communication using non-systematic error control codes
First Claim
1. A method for secure communication in a system involving a transmitter device, a receiver device, and an eavesdropper device, the transmitter device being configured to transmit to the receiver device on a main channel, the eavesdropper device being configured to listen on an eavesdropper channel to the transmitter device, the main channel having a first signal-to-noise ratio, the eavesdropper channel having a second signal-to-noise ratio, the method implemented in the transmitter device and comprising:
- encoding a message with a non-systematic error correcting code (NS ECC) to produce an encoded message without the message being carried in the clear; and
transmitting the encoded message to the receiver device using the main channel;
wherein the NS ECC has a defined characteristic such that when the eavesdropper device is more than a predetermined distance from the transmitter device, at least a portion of the message is unable to be recovered by the eavesdropper device decoding the encoded message.
1 Assignment
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Accused Products
Abstract
A transmitter device (110T) for secure communication includes: an encoder (170) configured to apply a non-systematic error correcting code (NS ECC) to a message, thus producing encoded bits with no clear message bits; and a transceiver (720) configured to transmit the encoded bits over a main channel to a receiver. A method for secure communication includes: encoding a message with an NS ECC to produce an encoded message carrying no message bits in the clear; and transmitting the encoded message over a main channel (120). The NS ECC characteristics result in an eavesdropper channel error probability under a security threshold (320) and a main channel error probability over a reliability threshold (310), whenever an eavesdropper (140) listening on an eavesdropper channel (150) is more than distance Z (220) from the transmitter. Unreliable bits in the encoded bits render the eavesdropper unable to reliably decode messages on the main channel.
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Citations
12 Claims
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1. A method for secure communication in a system involving a transmitter device, a receiver device, and an eavesdropper device, the transmitter device being configured to transmit to the receiver device on a main channel, the eavesdropper device being configured to listen on an eavesdropper channel to the transmitter device, the main channel having a first signal-to-noise ratio, the eavesdropper channel having a second signal-to-noise ratio, the method implemented in the transmitter device and comprising:
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encoding a message with a non-systematic error correcting code (NS ECC) to produce an encoded message without the message being carried in the clear; and transmitting the encoded message to the receiver device using the main channel; wherein the NS ECC has a defined characteristic such that when the eavesdropper device is more than a predetermined distance from the transmitter device, at least a portion of the message is unable to be recovered by the eavesdropper device decoding the encoded message. - View Dependent Claims (2, 3, 4)
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5. A transmitter device for secure communication in a system involving the transmitter device, a receiver device, and an eavesdropper device, the transmitter device being configured to transmit to the receiver device on a main channel, the eavesdropper device being configured to listen on an eavesdropper channel to the transmitter device, the main channel having a first signal-to-noise ratio, the eavesdropper channel having a second signal-to-noise ratio, the transmitter device comprising:
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an encoder configured to apply a non-systematic error correcting code (NS ECC) to a message to produce a plurality of encoded bits, wherein the plurality of encoded bits results in the message not being carried in the clear; and a transceiver configured to transmit the plurality of encoded bits to the receiver device using the main channel; wherein the NS ECC has a defined characteristic such that when the eavesdropper device is more than a predetermined distance from the transmitter device, a bit error probability on the eavesdropper channel does not exceed a predetermined security threshold while a bit error probability on the main channel exceeds a predetermined reliability threshold; and wherein a subset of the plurality of encoded bits render the eavesdropper device unable to accurately decode the message.
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6. A system for secure communication, the system comprising:
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a receiver device; and a transmitter device in communication with the receiver device using a main channel, the transmitter device configured to communicate a message without transmitting any of the message in the clear by applying a non-systematic error correcting code (NS ECC) and transmitting a portion of a plurality of encoded bits for the message; wherein the receiver device is configured to recover the message from the plurality of encoded bits that were transmitted; and wherein the NS ECC has a defined characteristic such that when an eavesdropper device listening on an eavesdropper channel to the transmitter device is more than a predetermined distance from the transmitter, a bit error probability for the eavesdropper channel does not exceed a predetermined security threshold while a bit error probability for the main channel exceeds a predetermined reliability threshold; and wherein the plurality of encoded bits includes a plurality of bits that render the eavesdropper unable to accurately decode the message. - View Dependent Claims (7, 8)
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9. A transmitter device for secure communication in a system involving the transmitter device, a receiver device, and an eavesdropper device, the transmitter device configured to transmit to the receiver device on a main channel, the eavesdropper device configured to listen on an eavesdropper channel to the transmitter device, the main channel having a first signal-to-noise ratio, the eavesdropper channel having a second signal-to-noise ratio, the transmitter device comprising:
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a physical layer component of a protocol stack, the physical layer component configured to receive a message from another component of the protocol stack, the physical layer component comprising an encoder configured to apply a non-systematic error correcting code (NS ECC) to the message to produce a plurality of encoded bits, the plurality of encoded bits being produced such that the message is not carried in the clear; and an RF transceiver configured to transmit the plurality of encoded bits to the receiver device using the main channel.
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10. An encoder residing in a transmitter device, the encoder providing secure communication in a system involving the transmitter device, a receiver device, and an eavesdropper device, the transmitter device being configured to transmit to the receiver device on a main channel, the eavesdropper device being configured to listen on an eavesdropper channel to the transmitter device, the main channel having a first signal-to-noise ratio, the eavesdropper channel having a second signal-to-noise ratio, the encoder comprising:
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coding logic configured to apply a non-systematic error correcting code (NS ECC) to a message to produce a plurality of encoded bits such that the message is not carried in the clear; and puncture logic configured to puncture at least a portion of the plurality of encoded bits and to provide the at least a portion of the plurality of encoded bits that were punctured for transmission over the main channel; wherein the NS ECC has a defined characteristic such that when the eavesdropper device is more than a predetermined distance from the transmitter device, a bit error probability on the eavesdropper channel does not exceed a predetermined security threshold while a bit error probability on the main channel exceeds a predetermined reliability threshold; and wherein a subset of the plurality of encoded bits render the eavesdropper unable to accurately decode the message. - View Dependent Claims (11, 12)
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Specification