Attack Tolerance of Trust Management

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Niknafs, Mina | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43373 (19)
University: Sharif University of Technology
Department: Computer Engineering
Advisor(s): Jalili, Rasoul
Abstract:
Trust management is a new security solution for situations that there is not enough information about the members of a system. As other security solutions, trust management solutions are not secure against attacks and malicious behaviors. Collusion is one of the most destructive malicious behaviors in these systems. Colluders seek to unfairly affect the trust system. Most of the trust models are vulnerable against this malicious behavior or consider only a limited set of collusion scenarios to resist. Some other mitigation approaches are specific to a trust model and cannot be used by other models. One of the methods to implement trust is exploiting reputation. Reputation systems can be considerd a branch of trust systems. In this thesis, a new mitigation approach against collusion in reputation systems is proposed. This approach is compatible with the structure of most reputation models. “EigneTrust” and “PeerTrust” are two reputation models that are chosen to be compared against our approach. Implementation results show that our approach prevents colluders from increasing their reputation and decreasing the reputation of the other agents unfairly.
Keywords:
Trust ; Reputation ; Collusion Attack ; Trust Metrics ; Trust Management ; Tolerance

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