Steganography – derived from the Greek words meaning “covered Writing”, is the art of hiding information in ways that prevent its detection. It is a 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 steganograpy uses a host data or message, known as a “container” or “cover” to hide another data or message in it. The conventional way to protecting information was to use a standard symmetric or asymmetric key system in encryption. Steganography can also be used to place a hidden “ Trademark” 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 a 112 bit key then the message has become quite secure as far as cryptanalytic attack are concerned. Now, if this cipher text is embedded in an image, video, voice, etc., it is even more secure. If an encrypted message is intercepted, the interceptor may not know the object contains 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 of the human auditory system.


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