Steganography Case

Steganography: - derived from the Greek words meaning "coved writing ", is the art of hiding information in ways that prevent its detection. It is the method akin to convert channels, and invisible links, which add another step in security. A message in cipher text may arouse suspicion while an invisible message will not.

Digital steganography uses a lost data or message, known as a "container "or "cover" to hide another data or message in it. The conventional way of protecting information was to use a standard symmetric or asymmetric key system encryption. Steganography can also be used to place a hidden "trade mark" in images, music and software, a technique referred to as watermarking.

Steganography, if however used along with cryptography, for example, if a message is encrypted using triple DES (EDE) which requires 112 bit key then the message has become quite secure as for as cryptanalytic attack are concerned. Now, if this cipher text is embedded in image, video, voice, etc, it is even more secure. If an encrypted message is intercepted, the interceptor knows the text is an encrypted message.

With steganography, the interceptor may not know the object contain the message.

When performing data hiding on audio one must exploit the weaknesses of the Human Auditory System (HAS), while at the same time being aware of the extreme sensitivity human auditory system.