The unified image cryptography algorithm based on finite group

摘要

Image information security is an essential component of the network information security field. The main task of image cryptography is exploring the image cryptosystem with high processing speed and strong security. This paper studied the confusion and diffusion of images based on the finite group algorithm and then proposed a new uniform image cryptosystem which shared the encryption and decryption processes. The paper also suggested a keystream extension algorithm based on any length key. The speed of this image cryptosystem reached 5.54Mbps in the simulation environment. The absolute relative error of each performance index between its tested value and the theoretical value is less than 0.1%. The simulation experiments showed that the proposed image cryptography algorithm could be a candidate algorithm for the network image security technology.