基于多小波变换和混沌理论的图像加密法  

The Chaotic Image Encryption Algorithm Based on Multi-wavelet Transform

作　　者：宁梓淯[1] 李红岩[1] 于海涛[2] 李萌[1] 

机构地区：[1]哈尔滨医科大学-大庆医学信息学系,黑龙江大庆163319 [2]大庆油田工程有限公司,黑龙江大庆163712

出　　处：《哈尔滨理工大学学报》2012年第3期91-95,共5页Journal of Harbin University of Science and Technology

摘　　要：针对混沌映射加密过分依赖初值的弱点,采用多小波分解结合Arnold变换和混沌序列组合对数字图像加密.将均匀置乱像素位置和像素灰度值的方法应用于图像加密领域.实验结果表明,在尺度因子和分解层数一定的情况下,选取任意混沌映射初值和迭代次数,密文视觉效果良好,且密文垂直和水平相邻像素的相关性降低近均超过50倍,密钥量达到101000,即使对图像进行65%面积剪切,图像轮廓依然清晰可见.For the weaknesses of chaotic maps encryption over-relying on the initial value, based on multi- wavelet decomposition, images are encrypted by using Arnold transformation and chaotic sequence, and the method of even scrambling of the pixel position and pixel value are used in the field of image encryption. Experiments show that the scale factors and decomposition level of certain cases. Choose any chaos mapping value and iteration times, Ciphertext visual effect is good. The vertical and horizontal correlation between adjacent pixels nearly all reduce more than 50 times, key amount to 10l^1000. Even it is 65% cut, image outline is still visible.

关 键 词：图像加密 多小 波变换 混沌 均匀分布 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]