An image encryption algorithm based on the LSCMM chaotic map and bidirectional dynamic diffusion

Some classical one-dimensional chaotic systems have limited parameters and uneven distribution of chaotic sequences. Some image encryption algorithms are plaintext independent and have poor security. To solve these problems, an image encryption algorithm highly sensitive to plaintext is proposed. First, a new one-dimensional chaotic map consisting of the logistic map, the sine map, and the modular operation is constructed. Performance analysis shows that the system is suitable for cryptography, and its chaotic properties are better than the existing classical one-dimensional chaotic systems. Secondly, in the encryption algorithm, the complex chaotic sequences generated by the system are combined with the V-shaped scrambling method to replace the position of image pixels. Finally, a new bidirectional dynamic diffusion method is designed to make the image completely chaotic. The encryption scheme can also be extended to color images. Simulation results and performance analysis show the proposed algorithm has good security and encryption efficiency.