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• W2283864399 abstract "As information systems evolve to cope with the ever increasing demand of today’s digital world, so does the need for more effective means of protecting information. In the early days of computing, information security started out as a branch of information technology. Over the years, several advances in information security have been made and, as a result, it is now considered a discipline in its own right. The most fundamental function of information security is to ensure that information flows to authorised entities, and at the same time, prevent unauthorised entities from accessing the protected information. In a typical information system, an access control system provides this function. Several advances in the field information security have produced several access control models and implementations. However, as information technology evolves, the need for a better access control system increases. This dissertation proposes an effective, yet flexible access control system: the PolicyUpdater access control system. PolicyUpdater is a fully-implemented access control system that provides policy evaluations as well as dynamic policy updates. These functions are provided by the use of a logic-based language, L, to represent the underlying access control policies, constraints and policy update rules. The system performs authorisation query evaluations, as well as conditional and dynamic policy updates by translating language L policies to normal logic programs in a form suitable for evaluation using the well-known Stable Model semantics. In this thesis, we show the underlying mechanisms that make up the PolicyUpdater system, including the theoretical foundations of its formal language, the system structure, a full discussion of implementation issues and a performance analysis. Lastly, the thesis also proposes a non-trivial extension of the PolicyUpdater system that is capable of supporting temporal constraints. This is made possible by the integration of the well-established Temporal Interval Algebra into the extended authorisation language, language LT , which can also be translated into a normal logic program for evaluation. The formalisation of this extension, together with the full implementation details, are included in this dissertation." @default.
• W2283864399 created "2016-06-24" @default.
• W2283864399 creator A5028213530 @default.
• W2283864399 date "2006-01-01" @default.
• W2283864399 modified "2023-09-27" @default.
• W2283864399 title "Implementation of a Logic-Based Access Control System with Dynamic Policy Updates and Temporal Constraints" @default.
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• W2283864399 hasPublicationYear "2006" @default.
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