Image Encryption and Decryption Algorithm Based on Fractional Order Simplified Lorenz Chaotic System and DNA Coding

Abstract

Traditional information encryption techniques lead to inefficient encryption and affect image formats when encrypting images. Therefore, how to ensure the secure storage and transmission of digital images has become a great challenge in the current image processing research. Chaos, a relatively typical nonlinear system at present, has many advantages and meets the design requirements of image encryption systems. In this paper, we take the basic theory of chaos as the entry point and combine it with DNA coding operation to investigate the image encryption method. A new color image encryption and decryption algorithm are designed based on the research of scholars. Mainly, DNA encoding is performed first, followed by a permutation operation to solve the chaotic sequence, generate a DNA matrix and perform operations using DNA operation rules; finally, DNA decoding is performed to obtain the ciphertext image. In addition, to decrypt the image, the pixel average of each component is hidden in the last pixel of each component matrix, which further improves the security of the algorithm. The simulation experimental results show that this method of encryption and decryption works well.