مرکز منطقه ای اطلاع رساني علوم و فناوري - High-capacity data hiding scheme together using cryptography and steganography

Abstract :

Cryptography and steganography are the two significant techniques used in security of communication and in safe message transfer. These two methods are applied together to improve data reliability. In cryptography, a secret message is encrypted, and in Steganography the message is placed into image, or voice files. In this study, a hybrid model is proposed by combining, cryptography and steganography and an interface is designed for proposed model. In cryptography, the text to be encrypted with a keyword determined by user is encoded by creating a matrix. While hiding an encrypted text into the picture, a second password is required to increase security. The text to be encrypted in true color RGB image are hidden by changing the least significant 2 bits of red and green channels. Size of the encrypted secret message has been increased by changing 4 bits in totally. The carrier pictures utilized in this study have been determined as 24 bit/pixel color scale. In this study, quality of the stego images has been evaluated according to the quality measurement criteria of Peak Signal-to-Noise Ratio (PSNR-dB) and Structural Similarity Index (SSIM)