【作者】 董晓梅； 李晓华； 田跃萍； 于戈； 申德荣； 郑蕾；

【Author】 Dong Xiaomei,Li Xiaohua,Tian Yueping,Yu Ge,Shen Derong,and Zheng Lei (College of Information Science and Engineering.Northeastern University,Shenyang 110004)

【机构】 东北大学信息科学与工程学院；

【摘要】 关系数据库通常含有大量的数据,冗余很少,且经常需要一些例行的操作.因此,传统的多媒体水印技术无法直接应用于关系数据库.目前大多数数据库水印采用的都是空域方法,如何找到一种类似多媒体水印技术中的频域技术来提高水印的鲁棒性,需要进行更多的研究工作.提出了一个基于小波变换的关系数据库数字水印算法.关系数据库数字水印的嵌入使属性域的分布特性很容易发生变化,小波变换克服了因统计特征控制带来的水印嵌入运算负担.设计了相关实验,给出了对几种相关的攻击的实验结果.实验结果证明这是一个有效的关系数据库数字水印方案,具有较好的鲁棒性.更多还原

【Abstract】 Relational databases usually have large number of data but little redundancy.They often need some routine maintenance operations.So the traditional digital watermarking technologies for multi-media cannot be adapted to relational databases directly.Current watermark technologies for relational databases only utilize spatial domain methods.Therefore,more research work is needed to find out how to utilize frequency domain techniques to enhance the watermark robustness,as in watermarking multi-media products.In this paper,a watermarking algorithm based on wavelet transform for relational databases is proposed.According to the algorithm,wavelet transform is utilized,which is commonly used in watermarking multi-media files.The process of embedding watermarking information into database makes the change of static characters;wavelet transform can minimize this change.At the same time,computing load is decreased.Several experiments are designed to verify the usability and robustness of the algorithm.The experimental results on several kinds of attacks to relational database watermark are given.The experimental results show that the algorithm is effective and robust on common attacks.更多还原