Selective image encryption method based on dynamic DNA coding and new chaotic map

Abstract

In order to improve the various security indicators and encryption and decryption speeds of dynamic DNA coding in the field of image encryption, a selective image encryption method based on new chaotic map and dynamic DNA coding is proposed. In this paper, we first constructed a one-dimensional chaotic map with higher Lyapunov exponent and better dynamic behavior, and then improved the local graph structure algorithm to make it better to select the image region, and use the constructed chaotic map generates pseudo-random sequences to dynamically encode and manipulate the selected area of DNA, and finally generate a complete encrypted image. Experimental results show that compared with the existing methods, the proposed algorithm has a sufficiently large key space, better statistics and differential characteristics, and can resist common attacks such as chosen plaintext attacks, noise attacks, and differential attacks. Therefore, the algorithm has higher security, and significantly improves the encryption and decryption speed of dynamic DNA coding in the field of image encryption, which has a broad application prospect in the field of image encryption.