Side informed image watermarking algorithm with high security

A new secure fragile watermarking algorithm for secure communication is proposed in this paper, the idea of cryptography- and the idea of side information are introduced into the security domain of watermarking system. The main idea of the algorithm can be listed as follow. Firstly, the original image is segmented into blocks and the watermark is segmented into subsections. Secondly, the embedded position is calculated by using the idea of Hill Cipher and RSA. Thirdly, the watermark subsections is preprocessed by using the information of image blocks, subsections of watermark and embedded information as side information. By this method, each part of image blocks, watermark subsections and embedded 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.