基于分存分组的关系数据库数字水印算法

文章结合关系数据库的特殊性，提出了一种基于分存分组的数据库数字水印算法，通过该算法可以在关系数据库中嵌入实际意义的字符串水印信息。首先把水印信息进行加密，让版权所有者和公证方持有加密密钥，然后将加密的水印信息分存，最后将水印分存值分成比特不等组序列进行水印嵌入。在水印提取时，可以通过部分子水印信息恢复原始水印。实验结果表明该算法使嵌入的水印具有较好的鲁棒性和不可见性。

Digital Watermarking Algorithm for Relational Database based on Sharing and Grouping

The paper, in combination of the particularity of relational database, presents an algorithm of digital watermarking based on sharing and grouping. A string of bits is embedded into a database by this algorithm. The information of digital watermarking is encrypted first, and the owner and the public notary are let to have the encrypting key, then the watermark is shared with a trusted party, and then the shared watermark is cut into unequal bit sets for embedment. The original watermark could be recovered by joining the sub- watermarks together. Experiment indicates that this algorithm could make the embedded watermarking possess better robustness and invisibility.