摘要
为了研究水印容量对数据库水印可靠性的影响,在满足水印不可感知性的前提下,设计了数据库水印算法和实验测试平台。基于同等规模的数据库分别嵌入不同容量的水印,分析了水印容量对水印的提取匹配率、外在可视性、嵌入能量及其宿主数据库的影响。研究结果表明,在数据库的添加、改动及删除三种常规攻击中,随着嵌入水印容量的增大,水印提取匹配率随之下降,水印信息的外在可视性受到明显的影响,水印的嵌入能量显著下降。不同容量的水印对数据库造成的整体变化及误差不明显,改动攻击对数据库水印可靠性的影响最大。
In order to investigate the effect of watermarking capacity on the reliability of database watermarking, the watermarking algorithm and its experiment testing system are designed while keeping the invisibility of watermark at the same time. The influence of watermarking capacity on the extraction rate, extrinsic visibility, embedded power of watermark and its host database are analyzed according to the different capacity watermarks embedded in coequal database. The results show that the extraction rate of watermark is decreased, the extrinsic visibility of watermark is greatly influenced, the embedded power of watermark is significantly decreased with the increase of watermarking capacity based on some common database attacks such subset addition, alteration and deletion. The experiments also show that the different capacity watermarks have no significant influence on the overall change and error of database induced by embedded watermarks, and alteration attack has the most important influence on database watermarking reliability.
出处
《科学技术与工程》
北大核心
2012年第33期8933-8936,8942,共5页
Science Technology and Engineering
关键词
数据库水印
水印容量
可靠性
水印匹配
database watermarking
watermarking capacity
reliability
watermark match
