摘要： 分析802.11协议存在的主要安全隐患，对协议进行必要的改进，提出基于信誉的多令牌介质访问控制协议，通过攻击检测和通信行为监测建立网络节点的信誉机制。以此为依据进行多令牌管理，规定只有持有令牌的节点才能访问信道，从而实现具有安全性保障的介质访问控制。利用NS进行仿真，结果表明该协议能够检测到网络中节点的恶意行为并迅速做出反应，较好地保证了网络性能。

关键词: Ad Hoc网络, MAC层安全性, 入侵检测, 信誉, 令牌

Abstract: With some potential insecure factors in 802.11 protocol, credit-based multi-token media access control protocol is proposed. The mechanism of reputations for the nodes in the network through the detection of attacks and the observation of communication activities is set up. The management mechanism of tokens is based on the mechanism of reputations. The management mechanism regulates that a node can access the channel only when it holds a token, by which the protective mechanism with media access control can be realized. In order to verify the validity of this protocol, simulation is done on the popular network simulator NS. Simulation results indicate that it can react quickly when some malicious behaviors in the network are detected and effectively maintain the network performance.

Key words: Ad Hoc networks, MAC security, intrusion detection, reputation, token

中图分类号: 

• TP393.08