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Designing Mechanism for Controlling Query on OWL Documents based on the MA (DL)2 Logic-based Authorization Model

Fazelidoust, Narges | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48092 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Amini, Morteza
  7. Abstract:
  8. The emergence of semantic technology and its usage in different computational environments (especially the distributive environments) has increased the machine intelligence for more interoperability.This has resulted an abstraction (conceptual) layer above existing information and resources in these environments. Based on the unique characteristics of the semantic-aware environments, most of the proposed models for other environments are not applicable to this area, as they do not meet the security requirements of these environments. MA(DL)2-AM and SBAC are among the models that have satisfied a large portion of these requirements. Although documents are important assets of organizations there has not been extensive research done on query control of these documents. Therefore due to the importance of semantic documents in semantic-aware environments, this thesis proposes a query control mechanism on OWL documents based on semantic authorization models. In the proposed framework, access policies could be applied on queries in SQWRL language. To this aim, a query rewriting approach with the purpose of extracting maximum authorized parts of the document (based on the received query) is proposed. Since in this language the only operator is “SELECT”, the framework only controls “READ” accesses required for executing queries. In terms of implementation, the proposed framework does not have too much overhead in presence of the efforts make to retrieve whole authorized sub concepts of the requested concepts in a query. Hence, the query access control time is dependent on the reasoning time of access inference engine, moreover than the time required for query rewriting process, which is proposed in this thesis
  9. Keywords:
  10. Semantic Web ; Access Control ; Authorization ; OWL Documents

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