数字图像的通用加密算法

为了实现对数字图像信息的有效保护,提出了一种通用的数字图像加密算法.通过密钥产生一维混沌序列并排序,以排序后的序列的各数值的原来索引为序列,把图像像素移位到相应的序列位置,便实现像素位置置乱加密.通过自定义随机加密函数与图像像素异或运算实现像素值变换置乱加密,应用评价指标对加密效果和安全性进行分析.理论分析和实验结果表明,该算法密钥空间大,具有较好的加密效果和加密效率,并对统计分析具有较好的安全性和较强的抗剪切攻击能力.

Universal digital image encryption algorithm

In order to protect image's information,a universal digital image encryption algorithm is proposed.Firstly,one dimensional random chaos sequence is created by keys and sorted.After making an array of original indices based on the one dimensional random chaos sequence,the image's pixel positions is shifted by one-to-one with the corresponding sequence so that the image's pixel positions will be scrambled and encrypted.Then,the XOR operation is used to alter the pixel value in each pixel and the custom random encryption function to realize pixel value scrambling.Lastly,the effect of encryption is also analyzed by using the method of accessing.Theoretical analysis and experimental results show that the algorithm has a large space of keys,a good encryption effects and efficiency,a better security performance to statistical analysis and strongly against shearing attacks ability.