关键词: 移动点对点（P2P）网络, 信誉, 信任, 社会距离, 诋毁, 动态策略性攻击

Abstract: Most existing reputation-based trust models are based on the controversial assumption that “the higher serving credit one has, the more credible comments it provides”. This paper proposes a Social-Distance based Distributed Trust model（SD2Trust） for mobile P2P networks, which differentiates the reliability of recommending and that of service providing, constructs trustworthy node set and computes reputation computing weights by making use of social similarity. The distributed reputation storing structure and additional incentive approach together make it more suitable to mobile environment. Both theoretical analysis and simulation results show that SD2Trust can resist dynamic attacks with strategy and improve the success rate of transactions.

Key words: mobile Peer-to-Peer（P2P） networks, reputation, trust, social-distance, slandering, dynamic strategy attraction