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A novel tamper-proof model of Web pages using virus-based watermarking is proposed in this paper. The model provides a good security and accuracy about judging the situation of Web page tampering. The classifying theory based on virus is applied when watermark embedded and extracted. The proposed scheme is applied in all kinds of HTML or XML files, not just for English letters but also for the rest of characters. More importantly, it can be restored to the original file completely when the watermark is extracted. Therefore, the proposed scheme, associated with 3rd generation technology of tamper-proof for web pages, exhibits a good property of real-time performance and security. Experiment results show that it overwhelms existing schemes of tamper-proof in that it does not increase the file size and it does not expend great computing time such as cryptography.