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Among various attacks against watermarking security, copy attack can embezzle other people's copyright information, which brings challenge to copyright protection of digital works. In this paper, a new watermarking algorithm based on information layer encryption is proposed. This algorithm uses two keys to encrypt the original watermark. One key called public-key is generated by image feature, and the other called private-key is offered by user. This strategy ensures that if the watermark is copy to other carriers, the watermark detector will not decrypt it correctly. The experimental result shows that this algorithm can not only protect the watermark information from leakage, but also resist copy attack.

A Secure Watermarking Algorithm Resisting Copy Attack based on Information Layer Encryption