基于混沌与拟仿射的高效选择性彩色图像加密算法

一些传统的图像加密算法不仅计算量大,且在新型攻击方式下并不能提供安全保障。针对这些问题,提出一种更具安全性且轻量加密算法,结合数学模型拟仿射变换与混沌序列对彩色图像进行选择性加密。对明文图像进行分块,并计算每块的相关系数;与预定义的阈值相比,具有较大相关系数的块与斜帐篷映射生成的随机数进行异或运算;利用拟仿射生成的两种随机序列对图像进行重新排列。通过检测加密时间、相关系数、直方图、信息熵、秘钥敏感度等证明了该方案具有高效、安全的特性。

AN EFFICIENT SELECTIVE COLOR IMAGE ENCRYPTION ALGORITHM BASED ON CHAOS AND QUASI-AFFINE

Some traditional image encryption algorithms have great computation,and can not provide security under new attack methods.To solve these problems,this paper proposes a more secure and lightweight encryption algorithm,which combines the mathematical model of affine transformation and chaotic sequence to selectively encrypt color images.The plaintext image was divided into blocks,and the correlation coefficient of each block was calculated.Compared with pre-defined thresholds,XOR operations on the blocks with larger correlation coefficients and the random number generated by the skew tent map were performed.Finally,the image was rearranged using two random sequences generated by quasi-affine.The scheme is proved to be efficient and secure by detecting encryption time,correlation coefficient,histogram,information entropy and secret key sensitivity.