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Proceedings Paper

Watermark copy attack
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Paper Abstract

Research in digital watermarking has progressed along two paths. While new watermarking technologies are being developed, some researchers are also investigating different ways of attacking digital watermarks. Common attacks to watermarks usually aim to destroy the embedded watermark or to impair its detection. In this paper we propose a conceptually new attack for digitally watermarked images. The proposed attack does not destroy an embedded watermark, but copies it from one image to a different image. Although this new attack does not destroy a watermark or impair its detection, it creates new challenges, especially when watermarks are used for copyright protection and identification. The process of copying the watermark requires neither algorithmic knowledge of the watermarking technology nor the watermarking key. The attack is based on an estimation of the embedded watermark in the spatial domain through a filtering process. The estimate of the watermark is then adapted and inserted into the target image. To illustrate the performance of the proposed attack we applied it to commercial and non-commercial watermarking schemes. The experiments showed that the attack is very effective in copying a watermark from one image to a different image. In addition, we have a closer look at application dependent implications of this new attack.

Paper Details

Date Published: 9 May 2000
PDF: 10 pages
Proc. SPIE 3971, Security and Watermarking of Multimedia Contents II, (9 May 2000); doi: 10.1117/12.384991
Show Author Affiliations
Martin Kutter, Digital Copyright Technologies (Switzerland)
Sviatoslav V. Voloshynovskiy, Digital Copyright Technologies and Univ. of Geneva (Switzerland)
Alexander Herrigel, Digital Copyright Technologies (Germany)


Published in SPIE Proceedings Vol. 3971:
Security and Watermarking of Multimedia Contents II
Ping Wah Wong; Edward J. Delp III, Editor(s)

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