A Secure Image Encryption Algorithm Based on Composite Chaos Theory

This paper introduces chaotic image encryption to realize the secure transmission of digital images, and combines 1D and 3D chaotic systems into an image encryption algorithm. Firstly, two sets of logistic chaotic sequences were generated iteratively for pixel permutation, so were the initial values of the Bao system. Then, the chaotic sequence for pixel permutation and diffusion was generated based on the plaintext pixel value and Bao system. After that, the plaintext image was encrypted and decrypted by encryption and decryption formulas. Finally, the encryption process was simulated, and the algorithm performance was analyzed in terms of key space and correlation of adjacent pixels. The results show that our algorithm achieved better security than the traditional methods.