A Crypto-Stegano Hybrid Application on Spatial Domain

Abstract

The need for data security in communication is increasing with the developing technology. The best way to ensure data security is cryptography. Humanity has proposed many cryptography methods for hundreds of years. Today, there are complex cryptography algorithms, which are quite secure but require high processing power. Cryptography techniques used in the past are less secure but require less processing power. This paper proposes an improved version of Vigenère cipher, which is an old cryptography method. The cipher text generated with improved Vigenère cipher is also hidden in an image to keep it safe in transmission environment. The hiding process is carried out with steganography, another data security method. Thus, a method of communication that is both unsuspecting and secure has emerged. The cryptological security of proposed method is evaluated by measuring Avalanche effect, and the steganographic security is evaluated by SSIM and PSNR measurements.