Security of Fractal Watermarking Detection Boundaries Against Oracle Attacks
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The fractal detection boundary is an important countermeasure to the Oracle attack. The paper investigates the effect of the attacking distance between the distorted signals from which the Oracle attack starts and the detection boundaries on the accuracy of watermark estimations. Analysis and experiments show that it is more accurate to estimate the watermarks with high detection values. The Oracle attacks directly launched from the object signals can eliminate the negative effect of fractal boundaries and remove the watermarks successfully.