[转载]Steganography in Computer Graphics

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Steganography is the art of hiding data inside other les. If cryptography is the way you encode data, then steganography is the way you would hide them. From author name in a picture to governemental secrets on an audio tape, steganography is everywhere. But including data in a le means modifying the le itself so if steganography isn't done properly it might be trivial for a steganalyst to reverse your job. Steganography is a complex art requiring an important knowledge of le formats and a great sense of ingeniosity. While this paper does not aim to teach everything about the topic, I hope it will help you to get introduced to steganography's best kept secrets.