A key-recovery attack on authentication watermarking by li and yuan

Authors:
Hans Georg Schaathun
Affiliations:
University of Surrey, Guildford, England UK
Venue:
Proceedings of the 10th ACM workshop on Multimedia and security
Year:
2008

Citing 4
Cited 0

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Abstract

We present a key-recovery attack on a watermarking scheme for authentication and localisation due to Li and Yuan. The attack exploits a lack of diffusion in the system. Each bit of the key affects only a small region of the watermarked image. Even though a brute-force attack is intractible, an exhaustive search is possible by considering one region at a time, and thereby recover the key.