| Paper: | ITT-P3.4 | ||
| Session: | Cryptography and Watermarking; Manufacturing Applications | ||
| Time: | Friday, May 21, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Industry Technology Track: DSP-Based Cryptography, Stenography, and Watermarking | ||
| Title: | RANDOMIZING THE REPLACEMENT ATTACK | ||
| Authors: | Darko Kirovskić; Microsoft Research | ||
| Zeph Landau; Microsoft Research | |||
| Abstract: | Billions of dollars allegedly lost to piracy of multimedia haverecently triggered the industry to rethink the way music and movies are distributed. As encryption is vulnerable to re-recording, currently all copyright protection mechanisms tendto rely on watermarking. In order to analyze the security of such systems, recently, a new breed of replacement attacks has been proposed that strongly affects most modern watermarking systems. A typical replacement attack relies upon the observation that multimedia content is often highly repetitive. Thus, the attack procedure replaces each signal block with another, perceptually similar block computed as a combination of other similar blocks found either within the same media clip or within a library of media clips. In this paper, we demonstrate that by randomizing the attack algorithm, its performance can be improved in almost all aspects: attack efficacy, distortion, speed, and size of the look-up media library. We describe the logistics of the new attack and an exemplary implementation against a spread-spectrum data hiding technology for audio signals. | ||
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