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Secure modulation and demodulation

  • US 7,369,658 B2
  • Filed: 05/02/2003
  • Issued: 05/06/2008
  • Est. Priority Date: 04/07/2003
  • Status: Expired due to Fees
First Claim
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1. A transmitter for securely transmitting a signal, including:

  • an input interface for receiving the signal; and

    a nonlinear keying modulator configured to encrypt the signal using a nonlinear keying modulation technique;

    wherein the nonlinear keying modulator has a nonlinear transfer function that is variable depending on the signal, andwherein the nonlinear keying modulator has an associated nonlinear keying demodulator with a transfer function that is an inverse of the nonlinear transfer function and that can be used to decrypt a nonlinear keying modulation encrypted signal;

    wherein the nonlinear keying modulator includes a plurality of linear filters, a plurality of nonlinear elements and a combination network connecting the plurality of linear filters and the plurality of nonlinear elements;

    the nonlinear keying modulator is configured by receiving a key derived from the configurations of a receiver; and

    the key includes topology information for deriving a topology of the nonlinear elements, the combination network, and the linear filters.

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