Extracting messages masked by chaos
Abstract
We show how to extract messages that are masked by a chaotic signal in a system of two Lorenz oscillators. This mask removal is done for two different modes of transmission, a digital one where a parameter of the sender is switched between two values, and an analog mode, where a small amplitude message is added to the carrier signal. We achieve this without using a second Lorenz oscillator as receiver, and without doing a full reconstruction of the dynamics. This method is robust with respect to transformations that impede the unmasking using a Lorenz receiver, and is not affected by the broad-band noise that is inherent to the synchronization process. We also discuss the limitations of this way of extraction for messages in high frequency bands.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- January 1995
- Bibcode:
- 1995STIN...9611750P
- Keywords:
-
- Chaos;
- Computerized Simulation;
- Data Transmission;
- Messages;
- Oscillators;
- Signal Distortion;
- Signal Transmission;
- Frequency Ranges;
- Masking;
- Noise Spectra;
- Strange Attractors;
- Synchronism;
- Communications and Radar