S-COI: The secure conflicts of interest model for multilevel secure database systems

The Chinese Wall policy is one of the well-known commercial security policies. it is used to specify information control when conflicts of interest arise. In other words, it maintains database security by means of classifying accessible data objects according to users' interest and limiting access to data objects that can cause conflicts of interest. In this paper, we propose a new model that decreases conflicts between user transactions by classifying data objects in a database system according to the users' interest. In order to achieve our goal, the Chinese Wall policy is newly interpreted and then applied to transaction processing in multilevel secure database systems. And then, more flexible concurrency control protocol based on the proposed model is suggested. Our model might be utilized as flexible security policy that prevents performance degradation of large database systems.