Steganography is the art and science of writing hidden messages in such a way that no one, suspects the existence of the message. The word steganography is of Greek origin and means "concealed writing".
In digital steganography, electronic communications may include steganographic coding inside of a transport layer, such as a document file, image file, program or protocol. Media files are ideal for steganographic transmission because of their large size. The advantage of steganography is that the messages do not attract attention to themselves. The stenography includes the concealment of information within computer files.
Digital images could be used for a number of different types of security threats. It is believed that the terrorists that died in the 9-11 crash in New York had aircraft configuration plans sent to them hidden inside of a digital image. The use of digital images for steganography makes use of the weaknesses in the human visual system, which has a low sensitivity in random pattern changes and luminance.The human eye is incapable of discerning small changes in color or patterns and because of this weakness text or graphic files can be inserted into the carrier image without being detected.
References:
iRevolution
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