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中文摘要：
由于一维混沌映射有可能退化为周期以及密钥空间相对太小等缺点。现结合一次耦合形式的二维Logistic混沌映射，由此映射生成混沌序列，在空域上对图像进行加密，然后对其加密后的图像进行小波分解，对其小波系数进行混沌映射变换，从而在小波域上进行置乱加密。通过计算机模拟实验结果进行分析表明，该算法改进了单一混沌映射的退化问题，同时明文的各种统计特性也得到了很大的改变，且能有效地抵御各种攻击。
英文摘要：
As the one-dimensional chaotic map may degenerate into a cycle and the weaknesses of key.It is combined with a coupling form of coupled logistic chaotic map which generates chaotic sequence and the image is encrypted in space.Then wavelet decomposition is achieved on encrypted image.The chaotic mapping transformation is implemented on wavelet coeffi- cients,which carries out scrambling encryption on wavelet domain.Conclusion from computer simulation results verifies that the encryption algorithm improves the degradation problems of single chaotic sequence with better randomness.The statistical properties of plain-image have great changes, and can effectively resist all kinds of attacks.
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