Implementation and Design of Chaotic Secure Communications

• Main Authors: Chuan-Kuei Huang, 黃川桂
• Other Authors: none
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/96847735138973449227

博士 === 國立雲林科技大學 === 工程科技研究所博士班 === 92 === The chaotic characteristic, the chaotic synchronization, and the secure communi- cation for the continuous-time and discrete-time chaotic systems are studied in this dissertation. To guarantee that the message can be transmitted and perfect recovered, the feedback controller gains are designed to achieve the synchronization between the transmitter and the receiver for the proposed chaotic systems. On the other hand, some basic electronic elements are used to implement the proposed secure communication chaotic systems. There are two subjects that are discussed in this dissertation. The continuous-time chaotic systems are the first part. We firstly propose a novel 3-order autonomous circuit to construct a chaotic circuit with double scroll characteristic. We use basic components, elements and operational amplifiers to make the novel chaotic systems. At the same time, the secure communication hyperchaotic system based on the proposed chaotic circuit is setup in this dissertation. Furthermore, the schemes of MRAC and VS-MRAC are used to overcome the noise effect and parameter uncertainty for the chaotic communication systems. On the other hand, we are also proposed a scheme of the bidirectional secure communication chaotic system. From the viewpoint of communication security, the bidirectional communication system can provide a so-called “theoretical security”. The theoretical security can be verified by the technique of frequency spectrum. At the second part, the discrete-time chaotic systems are also discussed. The synchronization between two discrete-time chaotic systems containing the observable scheme and controllable scheme are studied. To achieve the synchronization between the chaotic master and the chaotic slave, the method of pole-assignment is applied to design a controller. The controller can guarantee that the master-slave pair is asymptotic synchronization or dead-beat synchronization by choosing the suitable controller gains respectively. Furthermore, we present a secure communication hyperchaotic system based on the proposed schemes of the chaotic synchronization. To practically achieve the system performances, some electronic elements are used to implement the proposed scheme of secure communication.