MultiView model for object-oriented database

Up till now, a few secure models of object oriented databases have been proposed. Most of them support multilevel entities and more or less cover stories. In this paper, we undertake a more natural approach to model object oriented databases supporting multilevel entities which cope with the shortcomings of the previous models, viz the need of trusted mechanisms, the management of polyinstantiated objects and the inconsistency it may introduce in the database. The central idea is to decompose a multilevel object oriented database into a collection of single level databases. Hence, we split up the real universe into worlds corresponding to each security level. These worlds are the views of the universe by users at the corresponding levels, that was the reason of "MultiView" appellation. We present an animation of the MultiView model through creation, updating and consultation of objects. We show how we make use of cover stories without any specific problem. We also give a comparison with previous work and show how difficulties encountered in the earlier models can be avoided by the MultiView model.<
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