| In the 21st century, Internet has become the largest information carrier in the world. It promotes the development and change in all walks of life, and provides an opportunity for the development of Modern Distance Education. On the Internet, the digital resources are easy to copy, modify and diffuse, so that it is more convenient for those who steal them. As a result, digital watermarking as an effective solution to copyright issues becomes a hot spot. Databases are the main carrier for distance education resources, so their copyright issues are more important. The copyright protection for databases is not only determined by the enhancement of people's copyright protection consciousness, but also by the progress of copyright protection technology.[1] Thus, the database watermarking technology as a new technology for database copyright protection is been taken more seriously by people and been widely used.In this paper, we outline the development and research status of the database watermarking at first, on the basis of the embedded database watermarking algorithm are often faced with the contradiction between digital watermarking technology and database technology, which made the optimizing of relational database watermarking a necessity. Furthermore, how to ensure the amount of watermark information, the location to be marked and the strength of embedding are optimal becomes the focus of this study. Because using the genetic algorithm to optimize the relational database watermarking is time-consuming, and the watermark information is easy to disclosure, while the GAAA algorithm just overcomes the limitations of the genetic algorithm, so it becomes a best choice. The main research content and result are as follows:Firstly, we introduce an overview of the watermarking relational databases basic theory. On the basis of summarizing the experiences accumulated, we present a general idea of optimizing relational database watermarking, and this lay the groundwork for the next step. Secondly, a new relational database watermarking algorithm based on the improved genetic algorithm is presented. In this algorithm, the watermark generation process is optimized, and the watermark embedding process is also optimized, which enhance the anti-attack capability of the watermark greatly. Finally, on the basis of analyzing the characteristics of relational database, we present a watermarking algorithm based on GAAA.This paper focuses on relational database based on GAAA watermark optimization algorithm. Experiments clearly show that the proposed database watermark algorithm is flexible and convenient. This technique is resilient to deletion, insertion and other attacks. |
