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