一种基于RGB分量排序的索引替代信息隐藏算法*

提出了一种基于调色板图像的信息隐藏算法.该算法根据人眼视锥细胞对不同颜色分量的敏感度不同,通过对调色板颜色分量进行三次排序,得到最接近的像素颜色集及颜色孤立像素集,在像素颜色极为接近的集合中利用像素索引的最低有效位与嵌入比特位的一致性进行颜色替代来实现对信息的隐藏.分析了该算法的安全性及信息隐藏量.通过实验可看到在GIF图片中隐藏信息后人眼无法察觉,具有良好的隐蔽性.

Steganographic Algorithm Based on Index Replacement of RGB Sorting

A New Steganographic Algorithm for palette-based images was proposed.According to the theory that sensitivity of different color was different for cone cell of human eye,the palette was sorted by RGB,the set of the closest colors and color isolated were calculated,and LSB of pixel index which parity was correspond to bit embedded was replaced in the set of closest colors,it could arrive at the goal of hiding information in the images.Besides,the security and capacity of this algorithm were analyzed by comparing with EZ Stego.And experiment is done to show the effect in Gif image.