Secure Fragile Watermarking Algorithm with Side Information

Security is an important performance of watermarking system. In this paper, the idea of side information is introduced into the security domain of watermarking system, and a secure fragile digital watermarking algorithm with side information is proposed associating with the idea of cryptography. In the proposed algorithm, the original image is segmented into blocks and the watermark is segmented into subsections, and then the current subsection of watermark is preprocessed by using the former subsection of watermark as side information. The embedding position of each subsection of watermark is also chosen by using the position of the former subsection of watermark as side information. Each part of watermark and embedding position is good associated, so good security of the proposed watermarking system can be obtained. Experimental results show that the proposed algorithm can improve the security of watermarking system effectually.