Application Of Cluster Synchronization Of Complex Networks In Secure Communication

With the development of computer and communication technology,there are more and more video conferencing and video communication.It is urgent that video transmit insecure in the process of transmission.Video encryption becomes more and more important.With the characteristics of strong relevance and huge data,the traditional encryption algorithm can't be applied in video.Chaos is a motion that occurs in a certain and nonlinear system,which appears to be random.It is widely used in secure communication because of its sensitivity to initial values and unpredictable.The complex networks are widely used in many fields.The problem which secret key transmit insecure can be solved by using the synchronization of complex networks.Based on the synchronization of complex networks,a new video chaotic secure communication system is designed combined with chaotic cryptography.The main work can be summarized as follows:Firstly,it is considered that nodes are different in the complex network.The nodes in different community are described separately in the mathematic model.A synchronization controller is designed with pinning control scheme.Based on Lyapunov stability theory,a sufficient stability condition is given by which the nodes in the same community can achieve synchronization.Taking the complex network coupled by two communities as a simulation example,numerical simulation results show that the proposed controller can achieve cluster synchronization for the network.Secondly,based on the synchronization of complex networks,a new video chaotic encryption algorithm is designed combined with chaotic cryptography.The Chen system is selected as the source of chaotic signal,and realize the synchronization.The problem is solved which it is insecure that secret key translates in the transmission process.The video is operated by scrambling and its relevance is changed.The video is operated by spreading and the histogram distribution is changed.The statistical characteristics of video is changed and video is encrypted effectively.Thirdly,OK6410 is selected as platform.A cross-development environment consisting of a general-purpose computer and a development board is built.The Linux operating system is transplanted to the development board.In order to making the video chaotic secure communication system is convenient to operate,Qt/Embedded and QtCreator are transplanted and the graphical interface development environment is established.Next,the scheme of the system is designed.The video chaotic secure system is realized based on ARM platform.The main functions of the system include:video collection and encryption,video transmission in LAN,video decryption.At the same time,the system is analyzed from two aspects:histogram of image and pixel correlation.Finally,after summarizing the research work of this thesis,the main conclusion of this thesis is proposed and the direction to be further studied is pointed out in the area of the video chaotic secure communication.