CAJ | 학술논문

为了有效改进现有置乱算法所存在的不足，提出了一种基于像素位置置乱和色彩空间RGB亮度值置乱的双重加密算法。该算法首先利用新构造的位置置乱方法将二维矩阵中行和列映射到一维向量中，再采用Logistic映射产生一组伪随机序列，将伪随机序列由小到大进行排序，把排序后的每个元素对应的位置以集合序列的形式记录下来，形成密钥流；然后对一维向量按照密钥流形成的索引值进行重新排列，并将重排后的一维向量转换为与原始图像大小相同的二维矩阵即得到位置置乱后的加密图像。实验结果表明：该算法具有密钥空间大、加密后的图像直方图分布具有白噪声的特性，而且图像相邻像素的相关性更小，从而可大大提高抵抗不法攻击的能力，增加了图像的安全性。
위료유효개진현유치란산법소존재적불족，제출료일충기우상소위치치란화색채공간RGB량도치치란적쌍중가밀산법。해산법수선이용신구조적위치치란방법장이유구진중행화렬영사도일유향량중，재채용Logistic영사산생일조위수궤서렬，장위수궤서렬유소도대진행배서，파배서후적매개원소대응적위치이집합서렬적형식기록하래，형성밀약류；연후대일유향량안조밀약류형성적색인치진행중신배렬，병장중배후적일유향량전환위여원시도상대소상동적이유구진즉득도위치치란후적가밀도상。실험결과표명：해산법구유밀약공간대、가밀후적도상직방도분포구유백조성적특성，이차도상상린상소적상관성경소，종이가대대제고저항불법공격적능력，증가료도상적안전성。
In order to improve the deficiencies of the existing scrambling algorithm effectively,a new image encryption algorithm based on dual scrambling about pixel position scrambling and RGB color space inten-sity value was proposed.Firstly,the rows and columns of 2D matrix would be mapped into 1 D vector by making use of new proposed scrambling method based on pixel position.Then a set of pseudo sequence was generated by using the Logistic mapping,and it was ranked from small to large.The position that corre-sponding to each element was recorded by group sequence,which was called key stream.Finally,the corre-sponding pixel position of 1 D vector was scrambled by index value which was formed by key stream.The encrypted image was obtained by 1 D vector rearranged into a new 2D matrix.The experimental results showed that the proposed method had a large key space,and the scrambled image had a histogram distribu-tion of white noise.The correlation of image pixel values was smaller.It greatly improved the ability to resist the illegal attack and increased the safety of encrypted image.