基于相似粗糙集的决策数据库水印  

Similarity rough set based decision-making database watermarking

作　　者：张永[1] 杨永锋[1] 李敬明[1] 

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050

出　　处：《计算机工程与设计》2008年第6期1535-1537,1540,共4页Computer Engineering and Design

摘　　要：数据库水印因其独有的与其它多媒体水印不同的特征,在水印嵌入时也不能照搬多媒体水印技术。针对其容易破坏数据的使用价值和具有属性顺序敏感性等不足之处,提出了一种基于相似粗糙集的新算法,用粗糙集衡量条件属性的重要性,选出对决策影响最小的数值型属性作为候选属性,是数字水印嵌入前的预处理。按照提出的算法嵌入水印,既不影响数据库的决策,又避免了盲目选择嵌入属性可能造成对数据库完整性和一致性的破坏,有力地保护了数据库的原始性。Database watermarking has its own features which are different from multimedia ones,since existed multimedia watermarking algorithms aren＇t used directly into database watermarking.Existed algorithm is easy to destroy data usability and sensitive to attributes ordering.Aimed at those disadvantages of existed algorithms,a new algorithm,selecting embedding attributions according to similarity rough set,is proposed.It＇s only a preprocessing before watermark embedding.If watermark is embedded according to the improved algorithm,the decision-making of database will not been influenced and the possible destroy to integrity and consistency of database can be avoided after selecting attributes blindly.The algorithm can maintain the originality of database.

关 键 词：相似粗糙集 数字水印 关系数据 属性重要性 决策数据库 数据库安全 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]