B. B. Xia, X. F. Zhao, D. G. Feng, M. S. Wang
Abstract. Spread spectrum watermarking security can be evaluated via mutual information. In this paper, we present a new method to reduce mutual information by embedding watermark in the key controlled wavelet domain. Theoretical analysis shows that the watermark signals are diffused and its energy is weakened when they are evaluated from the attacker’s observation domain, and it can lead to higher document-to-watermark energy ratio and better watermark security without losing robustness. Practical algorithms of security tests using optimal estimators are also applied and the performance of the estimators in the observation domain is studied. Besides, we also present a novel method of calculating the key controlled wavelet filter, and give both numerical and analytical implementations. Experiment results show that this method provides more valid parameters than existing methods.
Cite the paper as:
 B. B. Xia, X. F. Zhao, D. G. Feng, M. S. Wang. Strengthening Spread Spectrum Watermarking Security via Key Controlled Wavelet Filter. Transactions on Data Hiding and Multimedia Security X, LNCS 8948, pp.1-20, Springer, 2015.