Digital Image Steganography is the concealing of a message in digital format. It is the practice or art of concealing a message in any medium or hiding the fact that communication is taking place, by hiding information in other information. It comes from the Greek word meaning "to cover tightly" and "writing" and in image steganography the image is hidden exclusively in images. The practice of hiding information comes a long way during the times of Herodotus who shaved the head of one his most trusted slaves and tattoed the message onto the slave's scalp in order to communicate with his son-in-law. Today steganography is mostly used on computers with digital data being the carriers and networks being the high speed delivery channels.
Because privacy and anonymity is a concern for most people on the internet, it allows for some morally consious people to safely whistle blow internal actions and for copyright protection on digital files using the message as a digital watermark. One of the main uses for Image Steganography is for the high-level or top-secret documents between international governments. Although steganography has many legitimate uses, it can also be used by hackers to send viruses and by terrorists to communicate secretely and safely. Although implementing image steganography is important, thinking of how to detect and attack it and the methods to do so are far more complex than actually doing the steganography itself.
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