The Analysis of Chaotic System and Application to Secure Communication

• Main Authors: C. H. Chen, 陳志恒
• Other Authors: S. C. Tsay
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/72368394637545149580

碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 89 === This thesis is concerned with the problems of the analysis and application of chaotic systems. In the analysis, a controller is designed to stabilize the state trajectories to a equilibrium point. On the other hand, a robust control is proposed to guarantee the chaotic system with uncertainties can been stabilized. Furthermore, a master-slave scheme is designed to construct a communication systems. By the Lyapunov stability theorem, a controller is designed to synchronize the master and slave systems. Recently, security problem of master-slave systems based on chaotic circuit is recommented, therefore, to develop a high secure communication system is the other subject of this thesis. We combined the concept of chaotic synchronization and cryptograph to achieve a more security communication system. Recently security is obvious in the communication for master-slave systems by the chaotic system. It is due to that an observer by only one of the state variable. It is worth to study and research about chaotic system in the secure communication. On the second part, a scheme of hyperchaotic cryptographic system is presented. In the scheme, chaotic synchronization and cryptograph are combined to achieve a high secure communication by using synchronization method from the first part.