Chaos communications is an application of chaos theory which is aimed to provide security in the transmission of information performed through telecommunications technologies. In Mathematics, chaos theory describes the behavior of certain dynamical systems – that is systems whose state evolves with time – that may exhibit dynamics that By secure communications, one has to understand that the contents of the message transmitted are inaccessible to possible eavesdroppers.
In chaos communications security (i. e. , privacy) is based on the complex dynamic behaviors provided by chaotic systems. Some properties of chaotic dynamics, such as complex behaviour, noise-like dynamics (pseudorandom noise) and spread spectrum, are used to encode data. In Mathematics, chaos theory describes the behavior of certain dynamical systems – that is systems whose state evolves with time – that may exhibit dynamics that In Cryptography, pseudorandom noise (PRN is a signal similar to noise which satisfies one or more of the standard tests for Statistical randomness Spread-spectrum techniques are methods by which Energy generated in a particular bandwidth is deliberately spread in the Frequency domain, resulting On the other hand, being chaos a deterministic phenomenon, it is possible to decode data using this determinism. In Mathematics, a deterministic system is a system in which no Randomness is involved in the development of future states of the system In practice, implementations of chaos communications devices resort to one of two chaotic phenomena: synchronization of chaos, or control of chaos. Synchronization of chaos is a phenomenon that may occur when two or more chaotic oscillators are coupled or when a chaotic oscillator drives another chaotic oscillator In Chaos theory, control of chaos is based on the fact that any chaotic Attractor contains an infinite number of unstable periodic orbits
To implement chaos communications using such properties of chaos, two chaotic oscillators are required as a transmitter (or master) and receiver (or slave). At the transmitter, a message is added on to a chaotic signal and then, the message is masked in the chaotic signal. As it carries the information, the chaotic signal is also called chaotic carrier.
When chaos synchronization is used, a basic scheme of a communications device (Cuomo and Oppenheim 1993) is made by two identical chaotic oscillators. Synchronization of chaos is a phenomenon that may occur when two or more chaotic oscillators are coupled or when a chaotic oscillator drives another chaotic oscillator One of them is used as the transmitter, and the other as the receiver. They are connected in a configuration where the transmitter drives the receiver in such a way that identical synchronization of chaos between the two oscillators is achieved. Synchronization of chaos is a phenomenon that may occur when two or more chaotic oscillators are coupled or when a chaotic oscillator drives another chaotic oscillator For the purpose of transmission of information, at the transmitter, a message is added as a small perturbation to the chaotic signal that drives the receiver. In this way, the message transmitted is masked by the chaotic signal. When the receiver synchronizes to the transmitter, the message is decoded by a subtraction between the signal sent by transmitter and its copy generated at the receiver by means of the synchronization of chaos mechanism. Synchronization of chaos is a phenomenon that may occur when two or more chaotic oscillators are coupled or when a chaotic oscillator drives another chaotic oscillator This works because, whilst the transmitter output contains the chaotic carrier plus the message, the receiver output is made only by a copy of the chaotic carrier without the message.
Optical chaos communications
Chaos communications has been a success in optical communications. Optical communication is any form of Telecommunication that uses Light as the transmission medium
Articles
- Cuomo, K. M. and Oppenheim, A. V. "Circuit implementation of synchronized chaos with applications to communications" Phys. Rev. Lett. 71, 65-68, 1993.
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