Abstract: Peer-to-Peer （P2P） communities are essentially distributed systems in which peers communicate directly with one another to exchange information and execute transactions， and one peer usually participates in several communities. Existing reputation systems merely use the evidences within the scope of one community to derive reputation scores of peers， neglecting the social characteristics of peers’ reputation that can only be actually derived from information based on all communities they participate in. This paper proposes RepCom， a novel reputation composition service architecture to collect and manage trust evidences over P2P communities. RepCom introduces the reputation authority network （RAN） to publish， search and retrieve evidences of peers，and uses a logic-based engine to enforce community-based trust policies on evidences. RepCom helps to construct a novel service for reputation management that comprehensively reflects global behavior of peers in various communities.

Key words: service middleware, reputation composition, reputation evidences

摘要： 对等社区是一类支持网络节点对等的进行信息交换和交易的分布式系统。单个网络节点通常参与多个对等社区，但是现有信誉系统仅根据社区内部证据计算节点信誉，忽略了信誉只有综合考虑其参与的所有社区中的证据才能得到这一社会特性。提出了一种新的信誉组合服务体系结构RepCom在众多社区间实现相关信誉证据的安全收集和管理。RepCom引入一种信誉权威网络实现证据的发布、搜索和获取，并利用逻辑引擎实现基于社区的证据信任策略。RepCom有助于构造全新的通用信誉管理服务，使信誉能够反映节点在不同社区的全局行为。

关键词: 服务中间件, 信誉组合, 信誉证据