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小波变换和SHA-1相结合的图像压缩加密

DOI: 10.11834/jig.20130403

Keywords: SPIHT编码,SHA-1,图像加密,混沌映射,离散小波变换

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Abstract:

针对图像分层树集划分编码的安全性问题,提出一种将小波变换和SHA-1(securityhashalgorithm-1)相结合的图像加密算法(DSCE)。首先将图像小波变换后的系数分为低频和高频两部分,然后将低频系数、初始密钥及图像像素和,通过SHA-1置乱加密SPIHT编码高频系数;将部分加密高频系数和初始密钥,通过SHA-1置乱加密Huffman编码低频系数,在压缩过程中实现低频和高频部分相互加密。仿真结果表明,DSCE算法密钥空间大,对密钥和明文敏感,同时有效提高图像存储和传输效率。

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