基于Arnold变换的图像分存加密方法

Image encryption and sharing based on Arnold transform

为提高图像分存加密的安全性,提出一种将置乱加密、分存技术和像素扩散相结合的分存加密方法。首先,利用一维Logistic混沌映射产生Arnold变换的参数;其次,利用变参数的二维Arnold变换对图像进行像素位置置乱;最后,利用变参数的三维Arnold变换对置乱后图像进行像素值扩散并分存为两幅图像。实验结果表明,该方法的外部密钥敏感度较强,具有良好的雪崩效应,能够有效地抵抗明文和差分等攻击,且解密密钥与明文图像紧密相关。

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.