I disagree. JPEG can efficiently be used as a cover-object (Yep... Used to be called cover channel...) Some algo using a transform domain techniques (FFT or DCT) can "resist" JPEG compression down to 40% quality and even resist image format conversion. The LSB proposition made earlier is known to be the simplest and least efficient digital watermarking techniques. In fact, it is proven that if you use a sorted palette with LSB watermarking, you can easily destroy any watermark by randomly generating the LSB of every pixel without disturbing the quality of the picture (Not noticeable by human eyes). Check out the book : Information Hiding ISBN: 1-58053-035-4 Excellent beginner to intermediate book. Scary Math: YES!!;-)
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I disagree. JPEG can efficiently be used as a cover-object (Yep... Used to be called cover channel...) Some algo using a transform domain techniques (FFT or DCT) can "resist" JPEG compression down to 40% quality and even resist image format conversion. The LSB proposition made earlier is known to be the simplest and least efficient digital watermarking techniques. In fact, it is proven that if you use a sorted palette with LSB watermarking, you can easily destroy any watermark by randomly generating the LSB of every pixel without disturbing the quality of the picture (Not noticeable by human eyes). Check out the book : Information Hiding ISBN: 1-58053-035-4 Excellent beginner to intermediate book. Scary Math: YES!! ;-)