Author(s)

Ashraful Tauhid¹, Maisha Tasnim¹, Saima Arifin Noor¹, Nuruzzaman Faruqui², Mohammad Abu Yousuf²

¹Information & Communication Engineering, Bangladesh University of Professionals, Dhaka, Bangladesh.
²Institute of Information Technology, Jahangirnagar University, Dhaka, Bangladesh.

Cryptography and Steganography are two prominent techniques to obtain secure communication over the shared media like the Internet. Steganography is slightly ahead of cryptography because of its stealthy characteristics. In this paper, a new method has been proposed which combines cryptography and steganography to ensure even more secure communication. The Advanced Encryption Standard (AES) in spatial domain of the carrier/cover image and Least Significant Bit (LSB) replacement in the transformed domain of the same image has been used after performing a Discrete Cosine Transform (DCT) on the pixels. An additional layer of security has been introduced by applying XOR operation on the AES encrypted message with the pixel values of the carrier image. The Peak Signal to Noise Ratio (PSNR) of the proposed algorithm is better than most of the similar algorithms. With better PSNR, the proposed method depicts a three layer of security of the information and error free decryption.

Cryptography, Steganography, Security, Encryption, Decryption

Tauhid, A. , Tasnim, M. , Noor, S. , Faruqui, N. and Yousuf, M. (2019) A Secure Image Steganography Using Advanced Encryption Standard and Discrete Cosine Transform. Journal of Information Security, 10, 117-129. doi: 10.4236/jis.2019.103007.