ABSTRACT
To most people, the word “Chaos” paints a picture of complete confusion, a lack of order and rules. But for Scientists and Engineers Chaos may be paving the way to better telecommunications, a better view of the cosmos and life saving medical procedures. Chaotic systems provide a rich mechanism for signal design and generation with potential application to communications and signal processing.
Chaos is a typical behaviour of nonlinear dynamic systems, by which we mean an irregular seemingly random change in time or motion, which is complex to predict with precision in the long run. Chaos arises as a result of sensitive dependence on initial conditions and dependence on system parameters in any nonlinear system. A chaotic system seems to be random useless it is recognized as chaotic .All the physical laws governing the chaotic motion are perfectly deterministic.
I am focusing to the area where principles and ideas from chaos science are applied to implement a secure communication channel between Transmitter and Receiver. Because chaotic signals are typically broadband noise like and difficult to predict, they can be used in various context for masking information bearing wave form.
Using the concept Synchronized Chaotic System (SCS) - a secure communication scheme is demonstrated. Chaotic Lorenz Systems are used as chaotic generators in both Transmitter and Receiver and perfect synchronization is achieved between them. In this approach, a chaotic masking signal is added at the transmitter to the message signal and at the receiver; the masking signal is regenerated and subtracted from the received signal. The paper will be describing
Þ A circuit implementation of the chaotic Lorenz system.
Þ The chaotic behavior of the circuit closely matching the results predicted by numerical experiments.
Þ Various MATLAB simulations of chaotic system behaviour.
Þ VLSI implementation techniques of the chaotic cryptosystems.
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