LSB信息隐藏源程序

clc; close all; clear; A=imread('lena.jpg'); B=A; message='Hello,I am a little sister! '; m=length(message); imshow(A) title('原始图片'); n=size(A); k=1; % LSB 算法: for i=1:n(1) for j=1:n(2) if k<=m %如果消息输入完成则为0 h=bitget(double(message(k)),8:-1:1); else h=[0,0,0,0,0,0,0,0]; end c=bitget(A(i,j),8:-1:1); if mod(j,8) == 0 p=8; else p=mod(j,8); end v=0; for q=1:7 v=xor(v,c(q)); end v=xor(v, h(p) ); B(i,j)=bitset(A(i,j),1,v);%对A(i,j)的第一位置数 if mod(j,8) == 0 k=k+1; end end %end LSB end figure,imshow(B) imwrite(B,'new.jpg'); title('隐藏信息的图片'); %double(B(1,:))-double(A(1,:)) % read message: out=char; tmp=0 ; t=1; for i=1:n(1) for j=1:n(2) c=bitget(B(i,j),8:-1:1); v=0; for q=1:8 v=xor(v,c(q)); end if mod(j,8)==0 p=1; else p=9-mod(j,8); end tmp=bitset(tmp,p,v); if mod(j,8)==0 out(t)=char(tmp); t=t+1; tmp=0; end end end out