An image encryption algorithm based on mixed chaotic dynamic systems and external keys

An image encryption algorithm based on mixed chaotic dynamic systems including the Lorenz system, the Chen system and the LU system is proposed. With the map of the external keys, the initial conditions of the mixed dynamic systems are acquired and chaotic signals are generated subsequently, and then encrypt the plain image by masking with the chaotic signals. The simulation and analysis results show that the chaotic signals are greatly sensitive to the keys and the algorithm has a large space of keys, and at the same time, a good encryption speed, and better security performance to statistical analysis are acquired.