Hyperchaotic Synchronization And Its Application Of Seeure Communication

Chaos has been paid more attention increasingly as a proceeding project and science hotspot. Chaotic motion is a special form of nonlinear dynamic systems. chaos is a course of determinate and random-like, chaotic signals has the properties of ergodicity, aperiodic, uncorrelated, board band, noise-like and sensitivity to chaos system's initial conditions. These properties make the chaos signal be fit for applying in secure communication and information encrypting. But now the chaotic signal deciphering methods for the low-dimensional chaotic systems have emerged. Compared to chaotic system, hyperchaotic system has much more complex dynamical behaviour.The randomness and indeterminacy of system has enhanced much greatly, hence hyperchaos has much more extensive value in engineering application. For example, recent study indicates that, hyperchaotic signal is more difficult to predict by common methods such as rebuilding phase space, regress mapping, nonlinear predict, which are usually used for low-dimension chaos signal. So it has great application significance to design, implement and analyse hyperchaotic systems with at least two positive lyapunov exponents.The main motive of this paper contains is to analyse the synchronizations of chaotic and hyperchaotic systems. This article focuses on the application of hyperchaotic secure communication. In the following, we shown the main contributions1. In this thesis, we expatiate the definition of chaotic synchronization and its application of secure communication . The methods of chaotic synchronization such as drive-response synchronization and adaptive synchronization are analyzed.2. In this paper, the feedback control hyperchaotic anti-synchronization, the hyperchaoticgeneralized projective synchronization are researched thoroughly. With noise interfering, the synchronous performance is analyzed. The improved approach about feedback control hyperchaotic synchronization is proposed.3. This paper also researches the scheme of secure communication, simulating the secure communication systems by the scheme of chaotic masking and chaotic parameter modulation and study the square wave and sine signal in secure communication. Based on the chaotic synchronization, design chaos synchronized system for secure communications using the method of chaotic masking. Simulation results show the effectiveness of the method. In order to improve the security and hiding, a new communication scheme based on chaotic masking is introduced, By changing the system parameters so that the signal is more complex and covert, increase the complexity of signal transmission and improve the property of chaotic encryption systems. 4. Improved secure communication hyperchaotic system, in consideration of the complex structure of the system, this synchronous system can withstand the attack of isomorphism attractor. Analyse and numerical simulate the security and fidelity of the transmission signal, verify the feasibility of this approach.