The Research On Digital Watermarking Technology For Relational Database

With the increasing popularity of the Internet and the network technique further development and perfection, database on the network's rise and developing quickly, will bring on the data breaches, problems such as illegal copying makes people concern information database copyright protection, if don't take effective control of safety and copyright protection, it will often give attackers to make use of it and database owner will cause significant loss. Therefore copyright protection based on the database, has become the implementation of database security domain new hotspot.Digital watermark currently is a frontier hot direction in the academic circle information security. It can provide copyright protection as an effective solution through digital products embedded perceived or not perception of information to prove the ownership of the digital products or the inspection digital content of primitivism. Although there are many kinds of multimedia digital watermarking algorithm, as the database data real-time update and characteristics of static multimedia data are quite different, so multimedia data digital watermarking technology will not directly applied in the database. According to the relational database characteristics, watermarking technique can be studied in relational database, in order to protect the copyright of the relational database.Based on the analysis of research relational database itself characteristic and digital watermarking technology, spread spectrum technology based on the relational database watermark algorithm is proposed, the basic idea is: to produce spread spectrum watermark using spread spectrum watermarking techonlogy, then using these watermarking signal is embedded into the database of part of the tuple numeric attributes to protect database copyright.Simulation experiments show that the new algorithm has better concealment and robustness for various main attack, such as the tuple reordering, data update, tuple delete etc, aggravation of hangzhou ability.