HIGHER LEVEL SECURITY APPROACH FOR DATA COMMUNICATION SYSTEM BASED ON AES CRYPTOGRAPHY AND DWT STEGANOGRAPHY

摘要

Cryptography is used for secured data transmission, but the resulting unreadable messages usually attractother’s attention, so steganography is employed to hide the secret information to prevent attackers fromdiscovering the presence of secret data. This paper proposes an improved technique that combines bothAdvanced Encryption Standard (AES) algorithm for cryptography and steganography and takes theadvantages of using the high frequency coefficients of the cover image by applying the Discrete WaveletTransform (DWT).The proposed technique is employed to study the effect of hiding the encrypted secretmessage in 24-bit RGB image. The performance of the proposed method is evaluated in terms of the PeakSignal to Noise Ratio (PSNR) analysis, the payload embedding capacity and the histogram distributionanalysis. Comparison to other four associated works will be offered. Experimental results reveal that theproposed method gives a secure technique for data hiding and shows robustness against different attacks.