Patent ID: 7369658
Filing Date: 2008-05-06
Classification: H04K,H04L

Abstract:
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, and wherein 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.