Chaotic Secure Encryption Based On Synchronization Of Two-Layered Complex Networks

In recent years,due to huge amount of data being stored and transmitted through various communication network,the importance of information security has received considerable attention of researchers in various fields.Because the chaotic signal are characterized by random-like,aperiodic,broadband frequency spectrum and irregular evolution,moreover,chaotic systems are extreme sensitivity to initial conditions and parameters variations,it is suitable for applying in secret communication.Complex dynamical network is formed by coupling chaotic or other nonlinear dynamics systems.Due to the complexity of the network topology and dynamic form of network nodes are fickle,complex dynamical network appear more complex dynamic characteristics.Most of the existing works adopted a single chaotic system in there secure encryption architecture,we put forward new secure communication scheme based on the complete synchronization and generalized synchronization of two-layered complex dynamic network in this paper.The mainly content of this thesis as follows:1.This part introduces the research background and research situation at home and abroad of complex network synchronization and chaotic secure communication.2.Some basic theories of complex networks is briefly introduced,including the basic concept which are commonly used,the network model and the mathematical description of the complex network synchronization.3.We construct the model of two-layered complex dynamical networks whose node dynamics are identical for corresponding nodes,and analyze the feasibility of using drive-response synchronization method to synchronized two-layered network when the inner-coupling matrix are different.We put forward a new chaotic secure communication system based on complete synchronization of two chaotic networks,and prove the feasibility of this scheme through the simulation experiments.Furthermore,we demonstrate that this scheme has greatly increased the encryption key space of the system so that improve the system security through the numerical analysis.4.We construct the model of two-layered complex dynamical networks whose node dynamics are different for corresponding nodes.The sufficient conditions for realizing generalized synchronization of two-layered network whose corresponding node dynamics are different through theoretical derivation.Then a kind of chaotic secure communication scheme based on generalized synchronization of two-layered complex dynamical network has being put forward.Numerical simulation shows that this scheme can realize information encryption and decryption correctly not only in ideal conditions but also under certain channel noise.