【作者】 张春蕾；

【导师】 李莉；

【作者基本信息】 长春理工大学 ， 计算机应用技术， 2010， 硕士

【摘要】 论文介绍了数字水印技术的概念和原理、关系数据库水印技术的概念和原理,探讨了几种关系数据库水印算法,重点提出了一种基于循环冗余检验的关系数据库水印算法。该算法在经过秘密排序、嵌入比例控制、误差控制和元组分组之后的关系数据库中,嵌入经过加密和添加循环冗余检验码的水印信息;在提取和检测水印信息时,先计算关系数据库的散列值、元组选取和分组信息,然后在相应属性值中提取最低有效位,经过多数选举,最后利用循环冗余检验判断该数据库是否遭到恶意攻击和篡改,对于没有遭到恶意攻击和篡改的,将提取出的信息解密,从而得到水印信息。实验证明,本文提出的基于循环冗余检验的关系数据库水印算法具有安全性高、嵌入后数据可用性高、水印盲提取盲检测以及能检测篡改的特点。更多还原

【Abstract】 In this paper, the concept and the elements of the digital watermarking technology, and the concept and the elements of the watermarking technology based on relational database are introduced . Also, several relational database watermarking algorithms are discussed .This paper proposes a relational database watermarking algorithm based on cyclic redundancy check.We embed the digital watermarking ,which has been encrypted and added cyclic redundancy check code , into the database , after ordering the tuples clandestinely, controlling the proportion and error , and grouping the tuples . When we extract and detect the digital watermarking from the database , we should calculate the hash value ,proportion , error , and the information of grouping the database firstly .And then, we extract the least significant bit from the selected attributes .After most of election , we use the cyclic redundancy check to verdict whether the database has been attacked or tampered .If not , we decrypt the extracted watermarking information .The experiment shows that the relational database watermarking algorithm based on cyclic redundancy check has the following characteristics: high security, high data availability, blind watermarking, and the ability of detecting tamper.更多还原