Research Of Distributed Database Secure Control Technique

A nicer database secure design can availably protect data, preventing from an illegal interview and breaking. Currently in our country information-based construction ,a great deal of foundation equipments(include the database product) depend on abroad to usher in, the core technique controlled by the hand of the others, which can't insure to carry on a secure use and valid supervision.Therefore, the exaltation of data secure guarantee ability becomes the bottleneck problem for urgently needing resolving in 21 centuries to our country in the information technique realm.At present,there is still a great deal of problem in the application of the secure model of the distributed database.Under common circumstance, the secure usually is self-contradict with vivid in the database, while customer wanting to get stronger and vivid capability, needing the sacrifice to the database secure in some extent, vice versa.Based on distributed database system and secure characteristic, This text analyzed its database safe strategy and related secure model,the system appearance and operate rule, the system appearance and operate rule,studied the customer role management,safe strategy and the role authorition problem, specially emphatically studied the Bell.LaPadula model.(including its basic concept,system appearance,related operation and the secure rule gather).According to the actual application environment, this text carried Bell.LaPadula model to entity to turn, through a research discover that model adoption compulsory secure strategy, attain a vivid secure control not easily, so increase the secure strategy of the independent access control mechanism to carry on"flabby" to the original model, and relatedly increased rule, put forward a new kind of secure mechanism-DDM(the Distributed Database Discretionary Mandatory).Turn the rule principle according to the DDM secure mechanism and entity, designed a secure controller of database -DDS(the Distributed Database Secure distribute) controller adopted DDM secure mechanism, and established the secure control mechanism of the DDS secure controller.Through DDS secure controller in the application in the fulfillment, this text analyzed various functions and secure characteristics the of DDS secure controller, designing physically applied in the management project of the DDS controller, carrying out the distributed database secure control.