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sdwcq-attack Source Code

This is "The Multimedia Signal Processing and Security Lab", short WaveLab, website. We are a research group at the Computer Sciences Department of the University of Salzburg headed by Andreas Uhl. The short name "WaveLab" already indicates that wavelets are among our favorite tools - we have 15 years of experience in this area. Our research is focused on Multimedia Security including Watermarking, Image and Video Compression, Medical Image Classification, and Biometrics.
Python code implementing and testing the attack on the 'Watermarking Method Based on Significant Difference of Wavelet Coefficient Quantization' described in the paper

Peter Meerwald, Christian Koidl, Andreas Uhl, "Attack on 'Watermarking Method Based on Significant Difference of Wavelet Coefficient Quantization'", Transaction on Multimedia, 11:5, pp. 1037-1041, Aug. 2009.

Abstract: This paper describes an attack on the recently proposed 'Watermarking Method Based on Significant Difference of Wavelet Coefficient Quantization' [Lin, 2008]. While the method is shown to be robust against many signal processing operations, security of the watermarking scheme under intentional attack exploiting knowledge of the implementation has been neglected. We demonstrate a straightforward attack which retains the fidelity of the image. The method is therefore not suitable for copyright protection applications. Further, we propose a countermeasure which mitigates the shortcoming.

See README for details.

The code is available upon request.

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