P2P网络中基于信任的风险计算方法

Risk Assessment Approach Based on Trust in P2P Network

由于P2P网络的开放性和动态性,对等点信息交换不可避免地会给系统带来安全问题。提出了运用信任评价与传统的风险计算相结合的方法来评估对等点信息交换中的风险。风险度的计算来源于信任风险和后果风险。信任风险是对节点长期累积行为表现的评价,反映了信任和风险之间的关系;后果风险是对节点短期行为所导致后果的评价。仿真实验表明,运用基于信任的风险计算方法可以有效地评估对等点间信息交换的风险。

As a result of P2P network being open and dynamic,it is inevitable that peers＇ information exchange brings security issues to systems.A trust based approach was introduced in risk assessment,and a risk assessment method was put forword by combining trust estimation with the traditional risk calculation to evaluate the risk of information exchange between peers.Risk value is derived from estimation of trust risk and result risk.Trust risk is estimated accor-ding to the long-term behavior of a node,and reflects the relationship between trust and risk.Result risk is estimated according to the short-term behavior of a node.Simulation results show that the risk assessment approach based on trust can effectively work in P2P network.