A Novel Semi-Fragile Document Watermarking Algorithm

A novel document watermarking algorithm is proposed. In this algorithm a watermark is embedded into a WORD document by modifying the font color attribute. Experimental results show that this algorithm has good perceptual transparency, large capacity and security. It is robust to format change attacks and the WINRAR compress attack. This algorithm is sensitive to content attacks, such as adding, deleting and supplanting. It can locate tamper position and recover the original content which had been tempered.