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Constructing Secure Content-Dependent Watermarking Scheme using Homomorphic Encryption

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4 Author(s)
Zhi Li ; Nat. Univ. of Singapore, Singapore ; Xinglei Zhu ; Yong Lian ; Sun, Q.

Content-dependent watermarking (CDWM) has been proposed as a solution to overcome the potential estimation attack aiming to recover and remove the watermark from the host signal. It has also been used for the application of content authentication. In this work, we first present an analysis on why some prior work on CDWM pose potential security problems due to their inherent cryptographic weakness. With the aim of achieving cryptographic level of security, we then propose a novel CDWM scheme based on homomorphic encryption and dirty paper precoding. The general idea is to introduce a decryption module before watermark detection to create some nonlinearity and thereby inhibit conventional watermark attacks based on linear operations. We conclude this paper by bringing up some thoughts on the integration of watermarking and cryptography.

Published in:

Multimedia and Expo, 2007 IEEE International Conference on

Date of Conference:

2-5 July 2007

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