基于扩展的Asmuth-Bloom体系的数据库水印算法

Watermarking algorithm of database based on expanded Asmuth-Bloom scheme

Asmuth-Bloom体系是一种基于中国剩余定理的密钥分存门限方案。将Asmuth-Bloom体系思想应用于数据库水印算法,可以使水印具有好的安全性和抗子集攻击能力。但是,该算法对水印信息的分存处理,扩张了水印数据,相对减少了数据库可容纳水印信息量。将Asmuth-Bloom体系思想加以扩展,调整参数取值,不仅使水印具有很好的安全性和抗子集攻击能力,能够基于部分数据恢复水印信息,而且水印数据扩张大量减少,可嵌入的水印信息量大量增加,算法性能进一步提高。在数据库的版权保护中,该算法具有很好的应用价值。

Asmuth-Bloom scheme is a sharing secret algorithm based on Chinese remainder theorem.Using Asmuth-Bloom scheme in a database watermark can make the algorithm have a good effect of hiding and resisting subset attack.But,sharing watermark expands the watermark data and reduces the information capacity of the database.By expanding Asmuth-Bloom scheme and adjusting the parameters＇value,this algorithm has a good effect of security and resisting subset attack,embedded information increases,and the performance improves much.In protecting the copyright of database,this algorithm has good application.