DUAL LAYER SECURITY USING AES ENCRYPTION AND SECURE SYSTEM FOR HIDING MUTIMEDIA FILES IN DUAL RGB COVER IMAGES
B. Ramana Babu, Neethu Tressa · Journal of Emerging Technologies and Innovative Research · 2018
The fast growth in communication technologies and the increased availability of the public networks facilitated data transfer. However, the public communication channels are vulnerable to security attacks that may lead to unauthorized access to some information. Now a day’s there is a challenges faced by data or information security field. We have to make this data free from harm during transmission. The primary aim is to make an application which enable information by covering securely in statistically undetectable communication channel. The two important concept of securely transmitting information or data over a medium like steganography and cryptography. Although cryptography and steganography are used to provide data security. Steganography and encryption combined enhance security by providing dual layer protection to the data, as steganography aims at hiding the existence of the data itself and encryption prevents the correct interpretation of the data. Firstly, the Advanced Encryption Standard(AES)algorithm has been modified and used to encrypt the secret message. Secondly, the encrypted message has hidden into two color RGB cover image. The multimedia files split vertically into two parts; one part contains the least significant half-bytes, and the other part contains the most significant half-bytes. The two parts are hidden inside to uncompressed RGB cover images using a least significant 4-bit replacement technique. The dual stego images are expected to be send separately, through separate channels, to avoid capture of both stego files by an adversary. Extraction of the secret file is achieved through merging LSB half-bytes and MSB half-bytes from the two stego files. The extracted file is identical in content and structure with the original secret message.