IMAGE SECURITY USING WATERMARKING AND ENCRYPTION TECHNIQUE

Abstract

Watermarking algorithm typically used to identify ownership of image data but not pro- vide any security to the image data where as encryption algorithm provides security to image data, but not the ownership. In my proposed algorithm, I have combined both watermarking and encryption techniques for security as well as authentication of an image data. For image encryption and decryption i have used Blow sh and Advance En- cryption Standard (AES) which was based on block cipher. To get watermarked image for owner's authentication, we have been using the modi ed least signi cant bit (LSB) watermark algorithm. In rst step of the algorithm, original image and watermark logo is embedded using watermark embedding process. In second step we encrypted water- marked image using encrption algorithm i.e blow sh or Advance Encryption Standard (AES) to produced encrypted image. In third step we decrypted the encrypted image using same blow sh or Advance Encryption Standard (AES) decrypted algorithm. In fourth step we get the original image from decrypted image by using watermark extrac- tion process. This method is highly advisable when image sends from sender to reciever through a digital network system. The encryption technique will provided the security to image data when it transfers data in a network and watermarking provides ownership of image data at reciever end. We have also calculated PSNR and MSE value for orig- inal image and watermarked image. We also measures time taken for di erent phases like image embedding process, image encryption process, image decryption process and image extraction process.