New Four-dimensional Chaos and Its Application in Color Image Encryption

For the sake of better removing dependence of color image pixel values, this paper designs a color image encryption algorithm based on a new four-dimensional chaos. Firstly, a new four-dimension chaos is built through feedback control, which has three equilibrium points. In comparison with the original, this system is of more complex topology and better randomness. Secondly, the image channel R, G, B are combined into one matrix. Finally, the encrypted image is the result of scrambling the matrix on the bit. The experiment shows that the algorithm applies to color image encryption because of its large key space, good key sensitivity, high encryption and decryption efficiency, and was suitable for color image encryption.