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A Security Model based on Modal Description Logic for Semantic Web

Faghihekhorasani, Fathiyeh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39457 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Jalili, Rasool
  7. Abstract:
  8. With the growth of semantic-aware environments, such as semantic web, new security requirements are imposed in access control procedures. An access control model for semantic web should take the semantic relationships (in three scopes of subject, object and action) into account in its access decisions. Considering the advantages of logic based models and description logic foundation of semantic web, we use the description logic as a basis to propose access control models in this environment. On the other hand, in some applications, such as e-banking environments, policy definition with the constraint(s) based on previous users’ accesses might be crucial. To consider this aspect, in this research, two temporal extensions of description logics are used to propose two access control models, named as TDLBAC and TDLBAC-2. The components of two models are presented with consideration of description logic system architecture. For each model, the methods for storing security policy rules, semantic relationships, and access history are described. Moreover, we explain how to deal with access requests in the proposed models. Access control algorithms in each model are based on the underlying logic’s inference services. A discussion on time complexity and decidability of the algorithms is presented, as well. In each model, the patterns of security policy specification and the model’s services are described in details. At the end of the thesis, the evaluation and comparison of two models are presented
  9. Keywords:
  10. Semantic Web ; Access History ; Description Logic ; Temporal Logic ; Access Control

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