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Steganography is a branch of information hiding. It allows the people to communicate secretly. As increasingly more material becomes available electronically, the influence of steganography on the people lives will continue to grow. Many confidential information were leaked to a rival firm using steganographic tools that hid the information in music and picture files. The application of steganography is an important motivation for feature selection. In recent years, many successful steganography methods have been proposed.
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