Semantic authorization control for secure semantic data repositories

Alamri, A 2014, Semantic authorization control for secure semantic data repositories, Doctor of Philosophy (PhD), Computer Science and Information Technology, RMIT University.

Document type: Thesis
Collection: Theses

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Title Semantic authorization control for secure semantic data repositories
Author(s) Alamri, A
Year 2014
Abstract Semantic models help to achieve semantic interoperability among sources of data and applications. The necessity to efficiently manage these types of objects has increased the number of specialized repositories, usually referred to as ‘semantic databases' or ‘semantic repositories'. Semantic repositories and ontologies are gaining popularity in information and communication technology as well as in various applications such as healthcare, content management and life sciences, as an adequate way of accomplishing complex information-management tasks. An increasing number of project initiatives choose to formalize application knowledge using ontologies and semantic data representation. Access restrictions are necessary in standard information systems and have become an issue for semantic repositories. Due to the varying sensitivity of data, suitable access control mechanisms pertaining to a semantic repository should be in place in order to ensure that users can obtain access only to information they are authorized to see.

To enforce semantic authorizations in semantic knowledge bases, the semantic storage model is inefficient. Most semantic storage models support a monolithic schema with a single storage layer that stores all statements. To improve storage efficiency and enable effective management of semantic data, a semantic storage model is proposed in this thesis. The model also helps in designing flexible access restrictions in a semantic repository. Subsequently, this thesis presents an inference policy engine framework that employs authorization control to systematically secure access to, and prevent knowledge leakage from, a semantic knowledge base.

In addition, this thesis highlights the need to enhance authorization security across semantically heterogeneous repositories. Many organizations often have a need to share semantic knowledge-based content with selected members of other organizations, but sharing semantic knowledge across different organizations needs solutions for several problems. Differences in the vocabulary utilized by the organizations have to be resolved before knowledge can be shared. Also, if semantic databases are syntactically and schematically heterogeneous, information interoperation becomes a vital challenge. In order to allow users from multiple organizations to access different semantic database systems, a good semantic mediator access control mechanism is needed. In this thesis, a mediation system framework is proposed for secure interoperation among heterogeneous semantic repositories. The mediation system ensures flexibility of control and secure sharing of heterogeneous knowledge.

Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Computer Science and Information Technology
Keyword(s) authorization
access control
semantic web
semantic repositories
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Created: Fri, 27 Jun 2014, 14:40:33 EST by Lynne Johns
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