Image Encryption Algorithm Based on a Complex Chaotic System
In order to improve the small key space of the encryption algorithm based on low-dimen-sional system design,a new five-dimensional complex chaotic system is constructed,and its cha-otic dynamics properties are studied by using phase diagram,equilibrium point,Lyapunov expo-nential spectrum,bifurcation diagram and spectral entropy complexity.It is found that the dy-namic behavior of this system is rich,and it is more suitable for image encryption algorithm than low-dimensional system.Furthermore,based on this system,a new encryption scheme is pro-posed in this paper.The scheme includes three diffusion and one scrambling,which can increase the security of image transmission.Finally,the performance of the encryption scheme is analyzed by calculating key space,information entropy,correlation of adjacent pixels and so on.The anal-ysis results show that the encryption scheme designed in this paper has a large key space,good encryption effect and the ability to resist external attacks.
complex chaotic systemZigzag transformfinite field theoryimage encryption
万方数据
维普
