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Issue No.01 - January (2009 vol.20)
pp: 83-96
Ke Chen , Zhejiang University, Hangzhou
Kai Hwang , University of Southern California, Los Angeles
Gang Chen , Zhejiang University, Hangzhou
ABSTRACT
Abstract: Credential chains are needed in trusted peer-to-peer (P2P) applications, where trust delegation must be established between each pair of peers at specific role level. Role-based trust is refined from the coarse-grained trust model used in most P2P reputation systems. This paper offers a novel heuristic-weighting approach to selecting the most likely path to construct a role-based trust chain. We apply history-sensitive heuristics to measure the path complexity and assess the chaining efficiency. We discover successive edges of a trust chain, adaptively, to match with the demands from various P2P applications. New heuristic chaining algorithms are developed for backward, forward, and bi-directional discovery of trust chains. Our heuristic chain discovery scheme shortens the search time, reduces the memory requirement, and enhances the chaining accuracy in scalable P2P networks. Consider a trust graph over N credentials and M distinct role nodes. Our heuristic trust-chain discovery algorithms require O(N2logN) search time and O(M) memory space, if the secondary heuristics are generated off-line in advance. These are improved from O(N3) search time and O(NM) space required in non-heuristic discovery algorithms by Li, Winsborough, and Mitchell (2003). Our analytical results are verified by extensive simulation experiments over typical classes of role-based trust graphs.
INDEX TERMS
Peer-to-peer networks, trust delegation, role-based credentials, heuristic semantics, Internet applications
CITATION
Ke Chen, Kai Hwang, Gang Chen, "Heuristic Discovery of Role-Based Trust Chains in Peer-to-Peer Networks", IEEE Transactions on Parallel & Distributed Systems, vol.20, no. 1, pp. 83-96, January 2009, doi:10.1109/TPDS.2008.60
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