A new color image encryption scheme based on DNA sequence operations and novel hyper-chaotic system
Ruilin Liu, Shaofang Wang, Zeyuan Wang, Xi Gong, Shengao Zhang, Jiangze Zhou · Physica Scripta · 2024
Abstract Aiming at the problems of weak key sensitivity and small key space of image encryption algorithm,in this paper,we propose an image encryption algorithm based on four-dimensional memristive hyperchaotic system and DNA operation. The algorithm first calculates the initial value of the image information by Secure Hash algorithm 512(SHA-512) hash algorithm, substitutes it into the four-dimensional memory-damped hyperchaotic system to generate a sequence, and then obtains the key map by Logistic mapping and Sine mapping.The preprocessed image matrix is obtained by dot-multiplication operation of the plaintext image with the square matrix generated by Sigmoid algorithm after Arnold permutation.Then DNA encoding,DNA row-by-row operation and DNA decoding are performed on the key map and preprocessed image, and at the end, the encrypted image is obtained after rotating the first round encrypted image and the key map by 90° for the second encryption.Experiments such as robustness analysis,anti-differential attack,and adjacent pixel correlation analysis show that the algorithm has a large key space,strong key sensitivity and the encrypted image has a small adjacent pixel correlation.It is shown that the algorithm can effectively protect the communication encryption of digital images.