The Synchronization Of Chaotic System And Application In Secure Communication

Chaos is a kind of widespread phenomenon between nature and human society. It appears a kind of irregular and random movement in the certain system, displaying the complexity of thing. Recently, chaos synchronization has been an active research of the nonlinear subject. This new technology promises to have a significant impact on many novel engineering applications. The challenging research field has become a scientific inter-discipline involving many other fields. In this paper, my dissertation mainly focuses on the chaos synchronization and secure communication. The main content is depicted as follows:1．To this topic,we carried on to describe the background and present conditions to our research, and induced the main contents and innovations of this text.2．Described the chaotic phenomenon and introduced some mainly concept of chaos, definition and characteristic, and the development of the concept, at the same time discussed some concepts of chaos synchronization, theories and methods involved.3．Analyzed some contact and differentiations between the chaotic secure communication and modern communication, some differentiations and contact of chaos and, and path of the chaotic cryptography design,at the same time aim at several kinds secure communication technique based on synchronously spread at present to carry on to induce, combine with the chaotic cover technique and the five-orders Chua's modified electric circuit system, carry on the applied quest by constructing a kind of secure scheme, got the dependable verification from the emulation test.4．Analyzed the creation and development of Chua's Electric Circuit, then as to it's carry on the improvement, apply the Chua's modifided electric circuit to the chaotic communication.With the Lyapunov directly theorem and the Gerschgorin theorem,we acquired a feedback controller,at the same time we lead the cryptographic technique by multishift ciper to the hyperchaotic systems, constructed a cryptosystem, enhanced the level of security in the hyperchaotic communication systetms.Carried on the numberical emulation in the Matlab, make the synchronous error diagram of the system.Result indicated that the drive system and the responsive system can be good to attain synchronously.Emulation results indicates the method is efficiency.5．Discussing the design theories of the state observer, at the same time constructing the general method of the synchronous state observer, and proved the state observer gain can be obtained by resolution calculation method, with changing the parameter, we changed the state observer gain, thus attaining to regulate the refrain velocity of synchronous error.Take it into the application of secure communication finally, to take Rossler system as an example, proved the scheme from this text given is usefulness, via the state observer that chaotic synchronization encrypts deliver, emulation experiment also gives verification.6．Carried on to generalize the summary to the main research work of the full text, and to the research value of that topic, the development foreground and some existent problemses carried on the analysis.