基于混沌序列的通用数字图像加密算法

为有效保护数字图像的信息,提出一种基于混沌序列的通用的数字图像加密算法。先根据密钥及图像大小产生一个混沌序列,然后根据子密钥及图像类型将其转换为无符号整数序列,最后再依次与对应的像素值进行异或运算以实现置换加密。应用评价指标对加密效果与安全性进行分析。理论分析与实验结果表明,该算法密钥空间大,具有良好的加密效果、安全性与统计特性,且抗干忧能力较强。

Universal Digital Image Encryption Algorithm Base on Chaotic Sequence

In order to protect digital image’s information,a universal digital image encryption algorithm based on chaotic sequence is proposed.Firstly,according to the key and the size of image,a chaotic sequence is generated.Then,according to the sub-key and the type of image,the chaotic sequence is converted to an unsigned integer sequence.Lastly,pixel permutation encryption will be realized by using the XOR operation between the unsigned integer sequence and each corresponding pixel value in turn.The effect of encryption and security is also analyzed by using the evaluation index.Theoretical analysis and experimental results show that the algorithm has a large space of key,a good encryption effect,security and statistical characteristics,a strong anti-noise ability.