A Public-key Asymmetric Robust Watermarking Algorithm Based on Signalwith Special Correlation Characteristic

Yanjun Hu, Li Gao, Xiaoping Ma,                                      Zhigeng Pan, Li Li
China University of Mining and Technology,                       Zhejian University
College of Communication & Electronic Engineering,          State Key Lab of CAD&CG
221008, XuZhou                                                               310027, HangZhou
P.R.China

e-mail: huyanjun@cad.zju.edu.cn

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Abstract

A public-key asymmetric robust watermarking algorithm based on signal with special correlation characteristic is proposed in this paper. This algorithm is designed to permit pubic watermark detection while preventing the watermark from being removed without the private keys. A signal, which is pseudorandom sequence with special auto-correlation characteristic, is used as watermark, and the signalís characteristic is the foundation of this algorithm. Therefore we first construct the method of generating the pseudorandom sequence and prove its auto-correlation characteristic. Then we describe the algorithm in detail. Experiment results show that the algorithm is valid and robust to common signal distortions and malicious attacks.