中文摘要：

无线传感器网络的生存性已成为部署传感器网络的一个重要考量因素。可生存的无线传感器网络要求在多种攻击并发的情况下能够继续提供关键服务,基于此提出一种多种攻击方式下的、基于簇的无线传感器网络生存性评估模型。因传感器网络的簇中存在多个遭受攻击的节点,为了更准确地判定簇的状态,设计了一种阈值机制来触发因多种攻击而产生的状态之间的转移,准确刻画了网络在遭遇攻击后采取的反制措施。利用连续时间马尔可夫链建立生存性评估模型并求解出可用性与生存性指标,分析了影响传感器网络生存性与可用性的若干因素。仿真结果表明,提高网络修复率和攻击响应率能有效提高生存性与可用性,并且提出的模型能正确地区分网络遭受的攻击形式。

英文摘要：

Survivability of wireless sensor networks has emerged as a fundamental concern for sensor network deployment.One survivable wireless network demands continuous supplies of critical services under concurrent attacks.Due to such requirement,a survivability evaluation model of WSN under mixed means of attacks,where the network topology is described as a cluster-based one was presented.Because of several nodes being attacked in one single cluster,a threshold mechanism to trigger the transition between the states of WSN under mixed ways of attacks was designed to make countermeasures more accurately.Adopting the continuous time Markov chain,one survivability evaluation model of WSN is constructed,thus attributes as availability and survivability can be obtained.Parameters which influence the availability and survivability have been analyzed.Simulation results show that enhancing the repair rate and response rate of attack can improve the availability and survivability effectively and the introduced model can reflect means of attacks correctly.