Analysis On Database Security Technology And Study On Enhance System Security Technology

As foundation software of information system, it is significant for its security. Now most database systems use foreign product.in our country. It should be solved how to ensure secure use and audit effectively. Based on a plenty of papers, technology reports and dissertations, this dissertations make some research work on the field of secure theory and technology and study on secure enhancement based on Oracle database system.At last, a practical database application is realized. The main points are as follows:1) The research and developlement of information security are discussed.The situation of database security these days was intruduced. A world of data security risks are analyzed from many dimensions.The characteristics and fundamental requirement of database security issues are proposed. For Oracle database, the aspects of privilege admin based on roles, the granularity access control, audit and backup and restore technology are discussed.2) Based on Oracle database, database storage and transmit authentication, users password authentication, secure audit are realized.Database security functions improve by procedure, function and program packages.3) Discussing the security and rebusted of key function of a database system.A model which is to defense intrusion in outerlayer,to detection intrusion in the middle layer and to tolerate intrusion in the inner layer is given.It utilizes the techniques of both redundancy and diversity and integrates the techniques of detection intrusion and intrusion tolerant.4) Based on the theories and techniques, a pratical database application system "document administration system" is realized. It adds a multi-tier which incorporates identity authentication, storage and transmit encryption etc. These approaches are sloved in the application system which strengthen safety characteristic of the database system.