Cryptography – Key management – Having particular key generator
Patent
1995-09-29
1997-08-05
Barron, Jr., Gilberto
Cryptography
Key management
Having particular key generator
380 28, 380 46, H04L 912
Patent
active
056550227
ABSTRACT:
A filtered cascaded synchronized nonlinear system includes a nonlinear transmitter having stable first and second subsystems. The first subsystem produces a first transmitter signal for driving the second subsystem, and the second subsystem produces a second transmitter signal for driving the first subsystem. A first filter filters the second transmitter signal to produce a filter output signal. A subtractor subtracts the filter output signal from the second transmitter signal to produce a transmitter output signal which is transmitted to a nonlinear cascaded receiver. The receiver includes an adder for summing the received transmitter output signal with a receiver filter output signal to restore frequencies that were subtracted from the second transmitter signal in order to produce a first receiver drive signal. The receiver includes cascaded third and fourth subsystems that are respective duplicates of the first and second subsystems. The third subsystem is driven by the first receiver drive signal to produce a first receiver signal in synchronization with the first transmitter signal. The fourth subsystem is driven by the first receiver signal to produce a second receiver signal in synchronization with the second transmitter signal. A second filter filters the second receiver signal to produce the receiver filter output signal.
REFERENCES:
patent: 5245660 (1993-09-01), Pecora et al.
patent: 5291555 (1994-03-01), Cuomo et al.
patent: 5379346 (1995-01-01), Pecora et al.
patent: 5402334 (1995-03-01), Pecora et al.
U.S. Patent Applic. S/N 08/267,696, filed Jun. 29, 1994 Inventors: Thomas Carroll et al. Entitled: "Synchronization of Nonautonomous Chadtic Systems". Now U.S. Pat No. 5,473,694.
Barron Jr. Gilberto
Jameson George
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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