MP2P网下一种基于代理的安全反馈信任模型

Proxy-based Security-feedback Trust Model in MP2P Network

信任问题是移动对等网(Mobile P2P,MP2P)安全中的关键性问题。针对MP2P网与传统P2P网终端设备在编址、通信方式和标识上的差异性以及网络中可能存在的冒名、恶意诋毁、合谋以及"搭便车"等安全问题,提出一种MP2P网下基于代理的安全反馈信任模型(PSTM)。不同类别的代理服务器接入不同类型的终端,以屏蔽网络层终端设备之间的差异性。同时,代理服务器之间对信息的相互备份能够缓解服务器"单点失效"问题。在资源安全选择协议中对反馈方进行身份、资格的认证后进行相似性筛选并加权处理。在多粒度的信任值计算中引入全局节点贡献度和评价可信度,并将直接信任度分为面向节点的与面向资源的来激励移动节点真实地反馈信息。实验表明,PSTM能够减少诋毁以及合谋恶意行为,同时能够抑制"搭便车"行为,从而增加网络善意节点的交易成功率。

Trust problem is the key issue for Mobile P2P （MP2P） network security. In MP2P network, terminal de- vices＇ addressing mode, communication mode and identifiers are different to traditional P2P network. Some security is- sues such as：allusion attack, malicious slander and collusion, ＂free ride＂ phenomenon, are even more serious compared to traditional P2P network. Aiming at these above issues, a Proxy-based Security-Feedback Trust Model （PSTM） was proposed in this paper. Different types of terminal devices access to different proxy servers to shield the discrepancy be- tween different terminal equipments on MP2P device access network layer. Meanwhile, proxy servers can reduce the problem of single point failure with the method of related information＇s backup and recovery. Certificate Feedback Ra- ter＇s identification and qualification through security resource-selection protocol, then integrate trust information accor- ding to similarity of terminal and resource types with weighted method. Furthermore, set global contribution value and evaluation value in multi-granularity trust computation to motivate mobile peers＇ honest feedbacks. Divide mobile peer＇s direct trust value into peer-oriented and resource-oriented values to make trust feedbacks more authentic. Simulation ex- periments show that PSTM can reduce malicious slander and collusion effectively. It also can restrain selfish peers＇ free ride behaviors and increase successful cooperation rate of high-contributed peers in MP2P network.