基于混合混沌序列的对称图像加密算法设计

Design of a Symmetric Image Encryption Algorithm Based on Complex Chaotic Sequence

通过对部分数字化混沌图像加密算法的分析研究,设计了一种混沌对称图像加密算法。该对称图像加密算法以Logistic映射和Chebyshev映射生成的混沌序列为初始序列,以AES算法的S盒变换和记忆存储作为非线性变换。实验结果证明,算法克服了初始混沌序列和初始信号的相关性,输出的序列满足平衡性、大周期、高线性复杂度和理想的相关特性等基本的密码特性。算法设计环节中加入了记忆成份和压缩环节,使得针对这两个混沌映射的现有分析方法不再有效,并且可以实现较高的加密速度。

By analyzing and researching several digital chaotic image encryption algorithms, a kind of chaos-based symmetric image encryption algorithm is designed. The chaotic sequence of Logistic map and Chebyshev map is used as the initialization sequence, and the S-box and memory of the advanced encryption standard（AES） algorithm are used as nonlinear transform. The result of analysis and experiment proved that this algorithm eliminates the relativity of the initialization sequence and the original signal; and the out sequence is of balance, great cycle, high linearity complexity and perfect relativity, which are the basic characters of cipher. By using the memory and compress approach, the analysis method is not in effect which is usually used in analyzing these two chaotic maps; and the algorithm can encrypt in a higher speed.