A Security Model for Multi - level Object - Oriented DatabasesBased on

In this paper, we employ the view model given by Bertino to propose a new design approach for a secure multi-level object-oriented database system. The central idea is to provide the user with a multi-level view derived from a single-level secure object-oriented database. Hence the database operations performed on the multi-level views are decomposed into a set of operations on the single-level objects which can be implemented on any conventional mandatory security kernel. We show that this approach allows us to overcome the diiculties of handling content and context dependent classiication, dynamic classiication, and aggregation and inference problems in multi-level object-oriented databases.