Various kinds of distributed applications are realized by using object-oriented technologies. Object-oriented systems are composed of multiple objects which cooperate to achieve some objectives by passing messages. Object-oriented technologies are used to realize the interop- erability among the applications. In addition to realizing the interoperability, it is essential to make the system secure. The secure system is required to not only protect objects from being illegally manipulated but also prevent illegal information flow among objects. In this paper, we discuss role-based an access control model in the object-oriented systems and how to resolve illegal information flow by using the roles.
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