An image encryption algorithm based on improved low dimensional chaotic system

Abstract:
Low dimensional chaotic system has the advantages of simple structure, fast iteration speed and easy implementation. It is widely used in the field of security. However, it also has some defects, such as small key space, uneven output distribution and empty window area. On the basis of other researchers, this paper adds disturbance operation to the Logistics- Sine map, associates the system parameters with the random sequence generated by the system and affects each other, which improves the problem that the output sequence of the original system is not random enough. In order to prove the practicability and applicability of the improved system, a new dynamic image encryption algorithm for scrambling and diffusion at the same time is designed. The image summary is generated by hash function and combined with the key to achieve the purpose of one picture and one encryption. Through simulation experiments, it is proved that the algorithm has high encryption efficiency, can resist various common attack methods, and has certain application value.