Research On Watermark Algorithm For Relational Databases Based On Cloud Model

With the advent of the21st century, human beings have entered the digital informationages.The rapid development of computer technology and communication technologyacquire obvious effect, information sharing on the Internet has become possible. While suchservices and operation has brought some conveniences to our life, the protection of thecopyright and the security of digital information are suffering from a huge threat. Forexample, we can easily copy the digital products and modify the information contents. Howto help people to enjoy the fast internet as while as to protect the copyright of digital worksfrom infringements is becoming a pressing problem.As being an important branch ofinformation hiding techniques, digital watermarking technology emerges as required.Now, the digital watermarking technology study on the copyright protection of theimage, audio, video and other digital products. But the digital watermarking technology inthe relational database is not satisfied. This paper is about the embedding, extraction anddetection of the relational database watermarking. We try our best to improve the capacityand robustness of the embedding watermark on the premise of using database normally. Inthis paper, the main research contents and results are as follows:This paper describes the basic theory of the cloud model and chaotic model, and thensimulates on the models in order to analysis of the theoretical characteristics. The cloudmodel is a model from the quantitative transformation to the qualitative transformation.Thatis to say, between the qualitative description language and quantitative values representedtransformation model, it establishes the qualitative and quantitative interdependentrelationship. The form of the Logistic sequence is simple.We can use different chaoticsequences in order to get the different deterministic chaotic sequences.This paper attemptsto improve the digital watermark algorithm of the relational database based on cloud model.The parameters of the cloud model are modulated by using one-dimensional Logistic map inchaos theory sequence to improve the robustness.In addition, the multi-dimensional backward cloud generator algorithm is improved onthe basis of the classic cloud model generator algorithm. This way is for decreasing the errorof the reduction for cloud feature information.This paper combines Matlab soft with Access,mean while,uses the relational databasesfrom school databases. In the Matlab environment, I have written and run the programs ofalgorithms successfully. This algorithm can achieve the purpose of maintaining copyright in the range of allowable error. In the simulation of the relational database, I embedded,extracted, detected the watermark as well as made some common attacks to the databasetable, the results of the experiment were checked and analyzed the feasibility and therobustness of the algorithms.This paper has improved the relational databases watermarking algorithms based oncloud model achieve the safe handling of information and maintenance of copyright.