Integration of Cryptography and Steganography using Matlab for secure communication

Steganography is an art of hiding secret information into another cover medium like image, audio, video, etc. Cryptography is an art of converting plain data into unreadable format. Steganography can be integrated with Cryptography in order to enhance the security of data. Code: clc clear all close all warning off a=imread('testimage.png'); nexttile; imshow(a); title('Carrier Image'); x=imread('SECRET.jpg'); nexttile; imshow(x); title('Secret Image'); [r c g]=size(a); x=imresize(x,[r c]); ra=a(:,:,1); ga=a(:,:,2); ba=a(:,:,3); rx=x(:,:,1); gx=x(:,:,2); bx=x(:,:,3); sk=uint8(rand(r,c)*255);%Secret key rx=bitxor(rx,sk); gx=bitxor(gx,sk); bx=bitxor(bx,sk); nexttile; imshow(cat(3,rx,gx,bx)); title('Encrypted Secret Message'); for i=1:r for j=1:c nc(i,j)= bitand(ra(i,j),254); ns(i,j)= bitand(rx(i,j),128); ds(i,j)=ns(i,j)/128; fr(i,j)=nc(i,j)+ds(i,j); end end redsteg=fr; for i=1:r for j=1:c nc(i,j)= bitand(ga(i,j),254); ns(i,j)= bitand(gx(i,j),128); ds(i,j)=ns(i,j)/128; fr(i,j)=nc(i,j)+ds(i,j); end end greensteg=fr; for i=1:r for j=1:c nc(i,j)= bitand(ba(i,j),254); ns(i,j)= bitand(bx(i,j),128); ds(i,j)=ns(i,j)/128; fr(i,j)=nc(i,j)+ds(i,j); end end bluesteg=fr; finalsteg=cat(3,redsteg,greensteg,bluesteg); redstegr=finalsteg(:,:,1); greenstegr=finalsteg(:,:,2); bluestegr=finalsteg(:,:,3); nexttile; imshow(finalsteg); title('Stegmented Image'); for i=1:r for j=1:c nc(i,j)=bitand(redstegr(i,j),1); ms(i,j)=nc(i,j)*128; end end recoveredr=ms; for i=1:r for j=1:c nc(i,j)=bitand(greenstegr(i,j),1); ms(i,j)=nc(i,j)*128; end end recoveredg=ms; for i=1:r for j=1:c nc(i,j)=bitand(bluestegr(i,j),1); ms(i,j)=nc(i,j)*128; end end recoveredb=ms; output=cat(3,recoveredr,recoveredg,recoveredb); nexttile; imshow(output); title('Recovered Encrypted Image from Steganography'); red_band=bitxor(output(:,:,1),sk); green_band=bitxor(output(:,:,2),sk); blue_band=bitxor(output(:,:,3),sk); combined=cat(3,red_band,green_band,blue_band); nexttile; imshow(combined); title('Decrypted secret message signal'); Prerequisite: Secrets Hidden in Images (LSB based Steganography) | MATLAB https://youtu.be/ZXfNhSlXT0w nexttile documentation link-- https://in.mathworks.com/help/matlab/ref/nexttile.html Learn Complete Machine Learning & Data Science using MATLAB: https://www.youtube.com/playlist?list=PLjfRmoYoxpNoaZmR2OTVrh-72YzLZBlJ2 Learn Digital Signal Processing using MATLAB: https://www.youtube.com/playlist?list=PLjfRmoYoxpNr3w6baU91ZM6QL0obULPig Learn Complete Image Processing & Computer Vision using MATLAB: https://www.youtube.com/playlist?list=PLjfRmoYoxpNostbIaNSpzJr06mDb6qAJ0 🙏🙏🙏🙏🙏🙏🙏🙏 YOU JUST NEED TO DO 3 THINGS to support my channel LIKE SHARE & SUBSCRIBE TO MY YOUTUBE CHANNEL #DigitalImageProcessing #MATLAB #ComputerVision #Cryptography