Image encryption and sharing based on Arnold transform
WU Cheng-mao · Journal of Computer Applications · 2011
To improve the security of image sharing and encryption,an algorithm which combined the scrambling encryption with sharing technology and pixel diffusion was proposed.Firstly,the Logistic chaotic mapping algorithm was used to generate the parameter of Arnold transform.Secondly,two-dimensional Arnold transform with variable parameters was adopted to scramble pixel positions of the image.Finally,three-dimensional Arnold transform with variable parameters was adopted to diffuse pixel values of the scrambled image,so the image could be decomposed into two images.The experimental results show that the algorithm has a strong sensitive effect on the external keys,resists plaintext attack and differential attack effectively,and possesses favorable avalanche effect.Moreover,there is a close relationship between the internal keys and the original plaintext image.