Abstract:

Two key techniques used in communication confidentiality and secure message transmission are cryptography and steganography. The combination of these two methods improves data security. A secret message is encrypted in the cryptography, while the Steganography is placed in messages, images or audio files. In this study, a hybrid model is presented by combining cryptography and Stenography, and for this model a interface design is carried out. In the cryptography, the text to be encrypted with the keyword that the user will determine is encrypted by creating a matrix. The second password is entered as a security layer at the stage of the encrypted text hiding in the picture. The text to be encrypted is hidden in the real color RGB image by changing at least 2 bits of the "Red" and "Green" channels. A total of 4 bits can be changed and the size of the encrypted text can be stored in the image. The carrier images used in the study were determined at a 24 bit/pix color level. In this study, the quality of stego images was assessed according to the Peak Signal-to-Noise Ratio (PSNR) and the Structural Similarity Index (SSIM) measurement criteria.

Keywords: