基于混沌和位平面交换的彩色图像加密算法

Color Image Encryption Algorithm Based on Chaos and Bit Plane Exchange

摘要: 为了提高图像加密算法的加密性能和安全性，本文设计了一种新的基于混沌和位平面交换彩色图像加密算法。将彩色明文图像三颜色分量的高比特平面进行重构，并通过斜帐篷映射产生的伪随机序列，结合广义Arnold映射来进行位平面的置乱，将三颜色分量的高位平面的信息均匀分散到低位平面，有效降低高位平面之间的相关性。为了进一步提高加密算法的安全性和加密性能，算法使用实参数的广义Arnold映射生成混沌序列，对置乱图像进行扩散操作。实验和安全分析表明，该加密算法具有较高的安全性和较好的加密性能。

Abstract: To improve the encryption performance and security of image encryption algorithm, a novel color image encryption algorithm based on chaos and bit plane exchange operation is designed. The high bit planes of three color components for color plain image are reconstructed. The pseudo-random sequence generated by skew tent mapping is combined with generalized Arnold map to scramble the bit plane. The information of the high bit planes of the three color components is evenly distributed to the low bit planes, which effectively reduces the correlation between the high bit planes. The proposed algorithm uses the generalized Arnold map of real parameters to generate chaotic sequences to diffuse the scrambled image to further enhance the security and performance of the proposed image encryption algorithm. Experiments and security analysis show that the proposed image encryption algorithm has high security and better encryption performance to resist various attacks.