Program for steganography and retrieval of secret message using Matlab

Program for steganography and retrieval of secret message using Matlab

      The art and science of hiding information by embedding messages within other, seemingly harmless messages. Steganography works by replacing bits of useless or unused data in regular computer files (such as graphics, sound, text, HTML) with bits of different, invisible information. This hidden information can be plain text, cipher text, or even images.

PROGRAM: 

%Program for Steganography

clc;

img1=imread('D:\sample.jpg');

img1=rgb2gray(img1);

img1=double(img1);

[row,col]=size(img1);

img2=imread('D:\secret.jpg');

img2=imresize(img2,[row,col]);

img2=rgb2gray(img2);

img2=double(img2);

for x=1:1:row

    for y=1:1:col

        temp1=dec2bin(img1(x,y),8);    

        temp2=dec2bin(img2(x,y),8);      

        temp1(8)=temp2(1);

        steg(x,y)=bin2dec(temp1);

       

    end

end

steg=uint8(steg);

imwrite(steg,'D:\stego.tif');

subplot(2,2,1);

imshow(uint8(img1));

title('CARRIER IMAGE');

subplot(2,2,2);

imshow(uint8(img2));

title('SECRET DATA');

subplot(2,2,3);

imshow(steg);

title('STEGO IMAGE');

Output:

 

 

%Program for Retrieval

clc;

img=imread('D:\stego.tif');

[row,col]=size(img);

for x=1:1:row

    for y=1:1:col       

        temp=dec2bin(img(x,y),8);       

        if(temp(8)=='0')

           temp='00000000';

           img2(x,y)=bin2dec(temp);

        else

            temp='11111111';

            img2(x,y)=bin2dec(temp);

        end       

    end

end

figure(1);

imshow(img2);

title('Retrieved Image');

Output:

 

Download Program:

Program for Stenography

Program for Retrieval