AODV路由协议的安全性改进

针对Ad Hoc网络易遭受黑洞攻击而造成大量丢包现象的安全问题，提出了一种基于非合作博弈理论的安全路由方法。以Ad Hoc网络节点和恶意节点为对象建立双人博弈模型，理论分析证明该模型存在纳什均衡点，即对博弈的双方均存在优势策略。Ad Hoc网络根据自己的优势策略选择路由进行防御和网络传输，恶意节点根据自己的优势策略采取网络攻击行为。分析和仿真结果表明，新方法能有效地选择比较安全的路由，从而减少了恶意节点对Ad Hoc网络进行黑洞攻击造成的影响，降低了路由开销和网络丢包率。

Security improvement of AODV routing protocol

To defend the Ad Hoc network against blackhole attacks which cause a significant number of dropped packets,a new approach based on non-cooperative game theory is presented.A two-player game theory model is made regarding the Ad Hoc network as one player and malicious nodes as the other.Theoretical analysis proves that there exists a Nash equilibrium point in the model.There are dominant strategies for both parts of the two players.According to their own dominant strategies,the Ad Hoc network selectes a route to defend and to transmit packets,and the malicious nodes launch blackhole attacks.Analysis and simulation results show that the proposed approach can efficiently select a secure route in order to reduce the influence of the attacks by the malicious nodes against Ad Hoc network,and thus reducing the route overhead and the packet loss rate.