A Chaotic System Based Image Encryption Scheme with Identical Encryption and Decryption Algorithm  

作　　者：ZHANG Yong 

机构地区：[1]School of Software and Communication EngineeT~ing,Jiangxi University of Finance and Economics,Nanchang 330013,China

出　　处：《Chinese Journal of Electronics》2017年第5期1022-1031,共10页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61562035);the Natural Science Foundation of Jiangxi Province(No.20161BAB202058);the Science and Technology Project of Education Department of Jiangxi Province,China(No.GJJ14333)

摘　　要：A new symmetric key image encryption scheme based on hyper-chaotic Lorenz system is proposed.The encryption process and the decryption process are identical in the proposed scheme.They both include two diffusion operations,one plaintext-related scrambling operation and three matrix rotating 180 degrees operations.The hyper-chaotic Lorenz system is employed to generate the secret code streams to encrypt the plain image,and to implement the diffusion process with XOR operation.The plaintext-related scrambling is used in this scheme to make different plain images correspond to different secret code streams even when the secret keys are the same,so that the scheme can fight against the chosen/known plaintext attacks.Simulation results show that the proposed scheme has the merits of high encryption speed,large key space,strong key sensitivity,strong plaintext sensitivity,good statistical properties of cipher-text,and etc.,and can be used in practical communications.A new symmetric key image encryption scheme based on hyper-chaotic Lorenz system is proposed.The encryption process and the decryption process are identical in the proposed scheme.They both include two diffusion operations,one plaintext-related scrambling operation and three matrix rotating 180 degrees operations.The hyper-chaotic Lorenz system is employed to generate the secret code streams to encrypt the plain image,and to implement the diffusion process with XOR operation.The plaintext-related scrambling is used in this scheme to make different plain images correspond to different secret code streams even when the secret keys are the same,so that the scheme can fight against the chosen/known plaintext attacks.Simulation results show that the proposed scheme has the merits of high encryption speed,large key space,strong key sensitivity,strong plaintext sensitivity,good statistical properties of cipher-text,and etc.,and can be used in practical communications.

关 键 词：Image encryption Hyper-chaotic Lorenz system Identical encryption and decryption algorithm Plaintext-related scrambling Security analysis 

分 类 号：O415.5[理学—理论物理] TP309.7[理学—物理] TP391.41[自动化与计算机技术—计算机系统结构]