Steganography is the process of concealing a message so that only intended people can interpret it. This has been used for hundreds of years, and in the past it was used often by hiding text within a message, so that it appeared to be something else. Only people who knew the means of revealing the hidden message could find it, while all others viewing the document thought it was a different message.
Recently, with the new development of computer technology, steganography has been expanded by using it within computers as well. Images can be altered by changing the number of bits or changing the color to produce a completely different “hidden” image. Sound can also be a means of steganography, by changing the bits of a sound file, it can produce a different sound which can be the hidden message. Encryption is also a method of digital steganography in which information is encrypted and therefore, only viewed by intended users
http://en.wikipedia.org/wiki/Steganography
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