A Survey on Metamorphic Cryptography Concepts and Techniques

In steganography, we hide or conceal the secretmessage in a cover medium without doing any modification. I can take text, image, audio or video as a cover medium. However, steganography is enough to conceal a secret message without knowing the unauthorized user but, adding the concept of cryptography it becomes more secure. In cryptography, we encrypt the secret message into the unreadable form through various encryption techniques, the best the encryption technique is, the more secure the secret message is. In case if an unauthorized user accessed the secret message, he couldn't able to find the actual message, he will get the message in encrypted form. So, the combination of both steganography and cryptography is more secure instead of using one of them. The combination of steganography and cryptography is known as Metamorphic Cryptography. In this paper, I discuss the integrity of the cover medium, the potential for concealing the amount of secret message into it, the concept of steganography, cryptography, metamorphic cryptography, steganalysis, distortion techniques, steganography parameters, measures, various techniques along with the limitation and comparison.