Research on colour image encryption efficiency

In order to improve the efficiency of color image encryption, the encryption scheme based on Arnold transformation is analyzed about the encryption effect and encryption efficiency. The shortage of traditional method is pointed out, and the improved encryption scheme is proposed in this paper. The physical locations of pixels are scrambled and mapped to different colour spaces during the encryption process. A kind of inverter conversion algorithm for colour image is put forward in decryption process. Decryption time only depend on the encryption key instead of relying on the conversion cycle. Simulation results show that the algorithm could not only improve encryption efficiency, but also make a very good encryption effect. Furthermore, this algorithm is a simple, feasible colour image encryption method.