Research On Digital Watermarking Technology For Relational Database Ownership Protection

With the rapid development of information technology,the transmission and communication of multimedia information has become very easy.Social networks and sharing platforms have become an indispensable tool for information exchange in people's daily life.The rapid development of the internet industry has brought about not only tremendous changes in people's daily life and production methods,but also explosive growth of data volume.At the same time,with the continuous breakthrough of artificial intelligence technology,the valuable information hidden in massive data has been mined,which makes the data available,resulting in a series of data infringement problems.For the growing digital information,how to realize the ownership protection of data assets has become an important research direction in the field of information security.In the research of data asset ownership protection,the ownership protection of relational database data is one of the research difficulties and focuses in this field.This paper takes digital watermarking technology as the research object and studies new measures for copyright protection in relational databases,including the two aspects of watermarking robustness and watermark recovery methods.The specific work is as follows:(1)As for the data in the numerical relational database,this paper proposed a reversible digital watermarking method based on the clustering grouping method.Firstly,the improved clustering algorithm is used to group the database elements into N subsets,and then the watermark information is divided into N sub-watermarks.Next,the one-way hash function is used to select the embedded watermark and the specific position when they are embedded into the data.Finally,the multi-bit mapping method is used to embed one watermark repeatedly in all tuples of the same subset.The experimental results show that the watermarking scheme proposed in this paper can resist database structure attacks,and it has higher robustness than the existing watermarking scheme while ensuring minimum distortion of data.(2)After a network attacker with data piracy intention obtains data through illegal means,they often destroy the watermark information,which represents the copyright of the data,to obtain the ownership of the data.Based on this,this paper proposes a robust reversible watermarking method based on erasure code.The method encodesthe digital watermark based on the erasure code technology,and embeds the encoded watermark fragment into the database.When the attacker destroys or deletes part of the embedded watermark,the method can recover the complete embedded watermark information based on part of the watermark segment that extracted from the database.The experimental results show that when the watermark in the database is destroyed,the method can completely recover the modified or deleted watermark information according to the uncorrupted watermark segment,improve the robustness against attack and achieve the purpose of data ownership protection.