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on purposes.

Our universities and research institutions from the 1980s began the research and development of database technology , has achieved some research. Tsinghua University , Renmin University of China , Huazhong Science and Technology University and other universities on database security technology research and practice , and the development of basic B1 level security requirements DM3 database software. In 2003, the Chinese Academy of Sciences State Key Laboratory of Information Security based on the open source database management system Postgre SQL, develop a secure database systems LOIS. Huazhong University to design a database encryption system that can achieve the initial effect of database encryption , encrypted tables, fields can be freely chosen by the user , can do the encryption process is transparent to the application , but there are some problems . For example , multi -level key encryption system management mode , the cryptographic mechanism is relatively complicated. And requires hardware support , affecting the system's ease of use. These studies are very meaningful , but also have made some very good results. However, generally speaking , our database products and foreign mainstream database products, security and usability there is a gap .

The early 1980s , in the United States began a database encryption technology. IBM's C.Wood, EBFerriandea, RCSummers published an article "Database Security: Requirement, Policies, and Models" and George I, Davida LW, John BK published "A Database Encryption System with Subkey" [1], marking the beginning of the study database encryption technology .

To better protect the mobile environment, database security , the paper made the following studies :
( 1 ) discuss the security of Web database system used by the related technologies.
( 2 ) Design and implementation of the entire Web database system model structure and complete the entire system analysis and summary.
( 3 ) focuses on discussion of the Web database encryption implementation.

The first chapter introduces the purpose and significance of this study . Mainly discusses the current research status .
The second chapter discusses the mobile computing environment Web database security issues, analysis of Web database facing security threats.
The third chapter introduces Web database encryption -related knowledge, analysis of the data encryption principles and algorithms.
Chapter IV presents the database encryption technology. First introduced the encryption method of choice , then introduces encryption prone to problems .
CHAPTER primarily designed for Web -based data encryption database system.
Chapter VI of this thesis are summarized , and prospects for future work .
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