Chaotic privacy system and method
AssigneeLockheed Martin Corporation
InventorsRichard H. Sherman, Chamroeun Kchao, Billy Pettijohn
Life of this patent
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Abstract
Systems and methods for protecting privacy in transmitting an analog information signal. The present invention combines the information signal with an analog random signal generated by a chaotic circuit and transmits the signal. The received signal is synchronized using a receiving chaotic circuit. The received signal is demodulated using a synchronized replica of the analog random signal. The information signal is recovered since the product of the random signals generated in the transmitter and in the receiver, is unity. Techniques used in the present invention for generating chaos, synchronization, and signal recovery are also disclosed.
Claims8
A chaos privacy system for use in communicating an analog signal, the system comprising:
- a transmitter comprising:
- a key stream generator comprising a chaotic circuit that generates a key stream in response to a private key parameter, and transmits a key synchronization parameter;
- and
- a transmitting chaotic circuit that processes the analog information signal and the key stream to generate and transmit a cipherwave;
- and
- a receiver, for receiving the transmitted cipherwave, the transmitted key synchronization parameter, and a copy of the private key parameter, that comprises:
- a key stream generator comprising a chaotic circuit that processes the copy of the private key parameter and the transmitted key synchronization parameter to generate a copy of the key stream;
- and
- a receiving chaotic circuit that processes the copy of the key stream and the cipherwave to demodulate the cipherwave to recover and output the information signal.
A chaos privacy method for use in communicating an analog information signal, the method comprising the steps of:
- generating a random key stream using a chaotic circuit;
- processing analog information signals and the random key stream to generate a cipherwave that has a uniform probability density for all information signals, and random key streams;
- transmitting the cipherwave and a public key over a communication channel;
- receiving the cipherwave, and public key;
- synchronizing to the public key using a chaotic circuit to produce a copy of the random key stream;
- and
- processing the cipherwave and the copy of the random key stream to reconstruct the analog information signal.
Dependencies are inferred from the claim text.