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Steganography has a relatively short history; even today ordinary dictionaries do not contain the word "Steganography". Books on steganography are still very few. The most important feature of this steganography is that it has a very large data hiding capacity. Steganography can be applied to variety of information systems. Some key is used in these systems when it embeds/extracts secret data. One natural application is a secret mailing system that uses a symmetric key. Another application pays attention to the nature of steganography whereby the external data (e.g., visible image data) and the internal data (any hidden information) cannot be separated by any means. The authors will term this nature as an "Inseparability" of the two forms of data.
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