传感器编码网络广播认证协议研究

广播认证技术能抵御污染攻击，保障传感器编码网络广播通信安全。但由于网络资源受限，广播认证技术所引入的计算量使得网络又易遭受拒绝服务攻击。为了有效抵御污染攻击与拒绝服务攻击，并兼顾网络安全性与时间延迟，本文以节点遭受污染攻击概率为决策因子，采用博弈论的思想研究广播认证协议。首先考察安全传感器编码网络中中间节点的策略行为，归纳与总结典型的广播认证协议模式；针对广播认证协议模式选择中存在的两次博弈过程，研究先转发策略、先认证策略与先聚合策略，对各策略的博弈成本/收益进行量化；构造广播认证协议二阶段博弈模型，博弈的纳什均衡即为节点应选择的广播认证协议模式。实例分析验证了各策略成本/收益量化及博弈模型的有效性。 

The research on broadcast authentication protocols for sensor coding network

The broadcast authentication technology can protect broadcast information from pollution attacks for sensor coding network. Because the network resource is limited, and the broadcast authentication technology incurs new and lots of computational cost, the sensor coding network may suffer from denial of service attacks. In order to protect sensor network from pollution attacks and denial of service attacks, the broadcast authentication protocols are researched with the game theory. The probability of the pollution attacks is the crucial factor of the game. All Policies and actions of the middle nodes in broadcast authentication protocol are discussed, and the modes of broadcast authentication protocol are summarized. For the two game processes in the broadcast authentication protocol, forward first policy, authenticate first policy and combine first policy are researched deeply. Each policy’s cost and profit are quantified, and the two-phase game model of the broadcast authentication protocol is proposed. The Nash equilibrium of this two-phase game is the broadcast authentication protocol mode that each node should select. Each node uses the proper broadcast authentication mode according to the network environment, and network security and computational efficiency are improved simultaneously. The example shows the cost and profit quantification of policies are effective, and the game model is reasonable.