An Image Encryption Algorithm Based on Scrambling and Substitution Using Hybrid Chaotic Systems

The paper presents an image encryption algorithm based on two-dimensional (2D) Logistic map and complicated Chua´s system. Firstly it utilizes two chaotic sequences generated by 2D Logistic map to scramble a color image, and then uses the chaotic sequences generated by optimization models of Chua´s system to produce new pixel values. The simulation results demonstrate that the algorithm has good properties of confusion and diffusion, and the key space is large. For the encrypted image the distribution of pixel value has a random behavior and the values of adjacent pixels satisfy the property of zero correlation, showing that the proposed algorithm is of relatively high security and efficiency.