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.
出处
《哈尔滨理工大学学报》
CAS
2012年第3期91-95,共5页
Journal of Harbin University of Science and Technology
关键词
图像加密
多小
波变换
混沌
均匀分布
image encryption
multi-wavelet transform
chaos
even distribution
