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Trust-based Probabilistic Key Management in MANETs

Ahmadi, Mahdieh | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47317 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Movaghar Rahimabadi, Ali
  7. Abstract:
  8. Self-organized public key management scheme in mobile ad hoc networks (MANETs) is an inevitable solution to achieve different security services. The aim of such schemes is to find an efficient protocol which makes the node able to obtain the authenticated public key of another node. Public key transmission and verification is achieved using certificate chain or message authentication code, thus it needs other nodes cooperation. It is also notable that in heterogeneous MANETs which include malicious nodes, this method suffers from low throughput and spoofing attack. In this thesis, a novel certificateless, on-demand self-organized public key management scheme is proposed which is based on the probabilistic asymmetric key pre-distribution (PAKP) method. In PAKP method, each node is preloaded with a random set of public keys. The secure path between two nodes is composed of several successive direct secure links where intermediate nodes can read, drop or modify packets. Two subjective logic based models are exploited in this thesis in which the first one presents the subjective nature of trust between nodes and the other one considers path conditions and chooses the least number of nodes among the most trustworthy nodes as intermediate destinations. Consequently, the proposed method can prevent the malicious behavior, improve throughput and support the required security services without the need to transfer public keys. We then evaluate our approach using network simulator ns-3. Simulation results confirm the effectiveness and superiority of the proposed protocol
  9. Keywords:
  10. Trust ; Mobile Ad Hoc Network ; Public Key Management ; Probabilistic Asymmetric Key Predistribution ; Subjective Logic

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