基于复合混沌的遥感影像加密算法  

Remote sensing image encryption algorithm based on composite chaos

作　　者：李晓博[1] 周诠[1] 

机构地区：[1]中国空间技术研究院西安分院空间微波技术重点实验室,陕西西安710100

出　　处：《计算机工程与设计》2012年第11期4086-4090,4099,共6页Computer Engineering and Design

基　　金：国家重点实验室基金项目(9140C5303020601)

摘　　要：针对单一混沌映射密钥空间小、易受攻击且在有限精度的系统下受限等问题及高维混沌系统计算量大的缺陷,提出了一种基于Logistic映射与Chebyshev映射的遥感影像加密算法。借助原始图像产生辅助密钥,生成基于Logistic映射与Chebyshev映射的两个混沌序列,并将其逐位相乘而得到新的复合混沌序列,进而对遥感影像进行像素值异或和像素位置循环移位的双重置乱加密。实验结果及安全分析表明加密图像对原始图像和密钥敏感、复合混沌序列较好的掩盖了混沌的动力学特性,能够抵抗常规混沌加密分析,加密效果好、安全性能高、算法复杂度低,适合星上应用。An remote sensing image encryption algorithm based on Logistic map and Chebyshev map is proposed for the possible degradation of low-dimensional chaotic system and the high computing work of high-dimensional chaotic system. The auxiliary secret keys based on original image, as well as the chaotic sequences of the Logistic map and Chebyshev map are generated and adopted to generate a new reciprocally-multiplied chaotic sequence, and pixel position and pixel value of remote sensing image are dually encrypted by using it. Experimental results show that the encryption image varies sensitively with the variances of the secret key and the original image, and the distribution functions of chaotic sequences are concealed. The eneryption algorithm with better encryption effect, high security and less calculation is fit for remote sensing image encryption on board.

关 键 词：LOGISTIC映射 CHEBYSHEV映射 复合混沌 辅助密钥 加密算法 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]