Secure Data Transmission Using Steganography and Encryption Technique

Abstract

With the spread of digital data around the world through the internet, the security of the data has raised a concern to the people. Many met hods are coming up to protect the data from going into the hands of the unauthorized person. Steganography and cryptography are two different techniques for data security . The main purpose in cryptography is to make message concept unintelligible, whilesteganography aims to hide secret message. Digital images are excellent carriers of hidden information. We propose a method of combining steganographyand cryptography for secret data communication. In this paper, we propose a high-performance JPEG stegano graphy along with a substitution encryption methodology. Theapproach uses the discrete cosine transform (DCT) techniquewhich used in the frequency domain for hiding encrypted data within image. Experimental results show that thevisual and the statistical values of the image with encrypted databefore the insertion are similar to the values after the insertion thus reduces t he chance of the confidential messagebeing detected and enables secret communication . The effectiveness of the proposed method has been estimated by computing Mean square error (MSE) and Peak Signal to Noise Ratio (PSNR).