一种新的基于超混沌映射的图像融合加密算法

摘要

为了提高图像加密算法的安全性和加密效率，提出一种新的基于超混沌映射的图像融合加密算法。首先，利用Chen超混沌系统产生四条混沌序列，并对这四条混沌序列进行取小数部分、矩阵相乘及取索引值等变形处理；然后分别利用变形后的混沌序列对原始图像和密钥图像进行像素的位置置乱，接着用交换位平面和按位取反操作来扰乱其像素值；最后，执行加运算可得到加密图像。置乱程度和安全性分析表明，该图像融合加密算法具有较好的加密效果，较大的密钥空间和较强的密钥灵敏性，且可抗抵抗穷举攻击和统计攻击。%In order to improve the security of image encryption algorithm, we presented a new image fusion encryption algorithm. First, four chaotic sequences generated by Chen’s hyper-chaotic maps and we will intercepting fractional part, multiplying the matrices and taking the index value for these chaotic sequences. Secondly, using the chaotic sequences processed to scramble the locations of pixels from the original-image. Thirdly, carry out Bit-plane displacement and the bit negation operations to change the values of pixel. At last, adding the two obtained matrices to obtain the encrypted image. The scrambling degree and security analysis show that our algorithm can get good encryption effect, has widest secret key’s space, strong sensitive to secret key and has the ability of resisting exhaustive attack and statistic attack.