双混沌映射的土家织锦图案数字加密算法

Digital Image Encryption Algorithm of Tujia Brocade Design by Double Chaos

结合混沌序列易生成性、对初始条件敏感性、可完全重现性等特点,给出了一种基于混沌映射的土家织锦图案数字加密算法。首先对原始图案进行离散小波变换(DWT),变换的矩阵奇行与Logistic映射产生的二值序列异或,偶行与Hybrid映射产生的二值序列异或,然后对产生的新矩阵进行DWT逆变换,即得到加密的织锦图案。实验结果表明,本文算法具有较高的安全性和较好的加密效果。

We discusse the digital image encryption algorithm on Tujia brocade by chaos sequence theory.Firstly,the origin image is transformed by discrete wavelet transformation（DWT）,and the odd-line of the changed matrix operated with binary sequences of Logistic mapping by xor operation,and its even-line operated with binary sequences of Hybrid mapping.Then,the new encryption image is transformed by inverse discrete wavelet transformation（IDWT）.The experimental results show that the algorithm is more safety and better encrypted effect.