A New Image Encryption Algorithm Based on DNA Dynamic Encoding and Hyper-Chaotic System

Aiming at the deficiency of the low sensitivity of DNA encoding and chaotic encryption algorithms to text and key, and the limited encoding rules of DNA, etc. This paper presents a new image encryption algorithm based on DNA dynamic encoding and hyper-chaotic system. Firstly, the algorithm uses the SHA-3 algorithm to process the original image, generate a set of hash values, perform the dynamic encoding of the generated hash values and then carry out XOR operation with the original image, and then the generated hash values through Hamming distance processing to generate the initial value of the hyper-chaotic system. Secondly, the S-box is constructed by the sequence values generated by the hyper-chaotic system, and the XOR-shift manipulation is performed to the image by using the S-box. Finally, the image is scrambled by the hyper-chaotic Chen System. The simulation results and theoretical analysis show that the algorithm improves the sensitivity of key and the security of data transmission, and has better ability of anti-exhaustive attack, statistical attack and differential attack.