%/encryption
p=imread('flower.jpg');q=imread('msgimage.jpg');p1=rgb2gray(p) s=size(q);[r c]=size(p1);figure(1),imshow(q),title('original');q2=imresize(q,[r c]);qr=q2(:,:,1);qg=q2(:,:,2);qb=q2(:,:,3);l=r*c; qr=bitand(qr,uint8(240));p2=bitshift(p1,-3);im=bitor(qr,p2);im=cat(3,qr,qg,qb);%im1=imresize(im1,[s(1) s(2)]);
figure(2),imshow(p1);figure(3),imshow(im),title('final');=========================================%/decryption
ir=im(:,:,1);ig=im(:,:,2);ib=im(:,:,3);x=bitand(ir,uint8(240));y=bitand(ir,uint8(15));x=cat(3,ir,ig,ib);figure(1),imshow(x);figure(2),imshow(y);
MATLAB: I have written a code to hide a grayscale image within a rgb image.but while decrypting.the rgb image is retrieved.but the grayscale image is not.a black image is displayed instead.
MATLAB
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