Concealment cipher: Also known as a steganographic cipher, concealment cipher hides the existence of a message within another innocent-looking message. Unlike traditional ciphers, which make it apparent that a message has been encrypted, a concealment cipher’s goal is to prevent an observer from even suspecting that a hidden message exists. This is achieved by embedding the secret information within the ordinary data in such a way that it doesn’t alter the apparent nature of the data. This term is often used interchangeably with “steganography”.