关键词: 图像分存, Logistic映射, Arnold变换, 图像置乱, 像素扩散

Abstract: 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.

Key words: image sharing, Logistic mapping, Arnold transform, image scrambling, pixel diffusion