Spatiotemporal Chaos Based The Research Of Secure Communication System

The research about Chaos Control started in 1989,but the real landmark Ott who studied in the University of Maryland proposed the method of parameters perturbation control(eg :OGY method),we achieved success by control strange attractors of unstable periodic orbits.This breakthrough allows researchers Chaos applications developed rapidly since Pecora and Carroll found that chaos can be synchronized and used circuit to realize synchronization Chaos.After that,Chaos for secure communication becomed a hot topic of research in the field of information security.This paper mainly proposed two-dimensional spatiotemporal chaotic encryption communication system.The reason to analyze the security of this system through analyzing the randomness of the chaotic secure communication system and the error function attack(EFA)is to realize its better application in secure communication system.The first chapter is the introduction,which introduced the generation and characteristics of chaos and the control and synchronization of chaos,and briefly introduced the basic knowledge of information security and cryptography.The second chapter put forward the mode and working mechanism based on the spatiotemporal chaos pseudo random number generator.The unique properties of the random statistical characteristics of pseudo random number generator were analyzed by the numerical simulation method,which indicates the generator has good comprehensive properties.It shows that the randomness of one-dimensional space-time communication system is very uniform and is beneficial to increase the security of secure communication system.The third chapter proposed the model of two-dimensional spatiotemporal chaos communication secrecy system,the randomness of the system key stream was analyzed.According to the uneven distribution phenomenon of the sequence of,take S-box exchanging method in order to improve the uniformity of the random sequence.At the same time,the spatiotemporal chaos communication system security was analyzed by the error function attack method so as to explore the possibility of finding the key.After calculation,it is proved that the error function attack method is costly to find the key and has lost its practical significance.In the fourth chapter,the anti-disturbance ability of two-dimensional space-time chaotic communication system was deeply analyzed,and the anti-noise ability of spatiotemporal chaotic system was calculated by the numerical simulation method.The computation results show that the spatiotemporal chaotic communication system is not only with high secrecy and high efficiency,but also has high reliability,which proves the high security of the two-dimensional space time chaotic communication system.