A New Image Encryption Scheme Based on 6D Hyperchaotic System and Random Signal Insertion

With the development of communication techniques and the Internet, how to protect private image transmission on the Internet has been a research highlight. Scholars have proposed different kinds of image encryption algorithms. Some of them are not secure enough. A novel cryptosystem is presented which is based on a 6D hyperchaotic system and random signal insertion. To enhance the dynamic performance of the hyperchaotic system, insert some random signals into the system variables during iteration. The sum value of all plaintext pixels is used to produce the initial values of the system. Thus, the proposed cryptosystem is closely related to the plain image. Split a pixel into two equal parts and form a larger matrix. Scrambling, cycle shift, and diffusion are operated on the new matrix. Finally, we obtain the encrypted image. The simulation results reveal that the proposed method has a very large key space, high key sensitivity and robustness, and is able to resist many different attacks. It is more secure than many other image encryption schemes.