【摘要】 无线传感器网络的安全威胁不仅发生在节点之间传递信息的时候,还发生在节点产生信息的时候,因此,单靠密码学和认证无法阻止传感器网络内部的攻击以及节点的异常行为。本文提出了一种基于无线传感器网络的信誉形式化模型,该模型形式化地描述了传感器节点信誉的表示、更新和整合。同时,通过对信誉分布和β分布的拟合分析与推理,发现β分布可以很好地描述与实现上述方案,由此设计了一个基于β分布的无线传感器网络信誉系统实例。实验表明,本信誉方案有较好的稳定性,能够抵抗诽谤攻击和信誉欺骗攻击,很好地解决无线传感器网络对数据认证的需求。更多还原

【Abstract】 Security threat can happen in a wireless sensor network not only while relaying information to the end-user but also while generating information. So, the conventional view of security based on cryptography and authentication alone is not sufficient for the unique characteristics and misbehaviors encountered in wireless sensor networks. A reputation formal model is proposed for wireless sensor networks, it provides a formal description method to sensors for reputation representation, update and integration. On the other side, the beta distribution system is founded to be fit for description reputation system by proving properties of beta reputation system; so, a case system based on beta distribution is developed. Simulation results show this scheme not only can keep stable reputation but also can prevent the system from some attacks as bad mouthing and reputation cheating.更多还原