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Systems and methods for providing opportunistic security for physical communication channels

  • US 8,213,616 B2
  • Filed: 09/18/2007
  • Issued: 07/03/2012
  • Est. Priority Date: 09/18/2006
  • Status: Expired due to Fees
First Claim
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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:

  • 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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