Abstract: To meet the demand of data authenticity in some sensitive data application scenarios，a reversible database watermarking scheme is proposed by using the prediction error expansion.The original data can be recovered losslessly from the unaltered watermarked relational databases.Extensive experimental results demonstrate that the proposed lossless database scheme has both good invisibility and robustness，and it obtains better robustness than other lossless database watermarking algorithms.

Key words: lossless watermarking, database watermarking, prediction error expansion

摘要： 为满足某些敏感数据应用中对数据真实性的要求，利用预测差扩展思想，提出一种可逆数据库水印方案，当水印数据库未遭受攻击时，可从中无损地恢复原始数据。实验结果表明该无损水印方案在保证水印不可见性的同时，具有一定的鲁棒性，并显示出比其他无损数据库水印更好的抗攻击性能。

关键词: 无损水印, 数据库水印, 预测差扩展