【作者】 舒军；

【导师】 孟嗣仪；

【作者基本信息】 北京交通大学 ， 信息网络与安全， 2008， 硕士

【摘要】 Ad hoc网络是由移动节点构成的，不依赖任何固定基础设施(例如基站)的无线网络。这种网络结构在军事、灾难救助、探险等通信基础设施无法覆盖或者遭到破坏的环境中有很好的应用前景。而在商业应用中，Ad hoc网络同样可以为无基础设施的环境提供强壮的通信服务，例如移动会议、传感器网络等。Ad hoc网络与传统网络不同，它不依靠预先构建的基础设施，因此传统网络采用CA实现集中式认证的方法并不适合这种网络。本文引入信任分散的安全策略，提出运用分群思想和概率签名的部分分布式认证方案，将Ad hoc网络的证书服务功能分布到网络中，并对分群部分签名概率算法进行了仿真试验分析。相比传统的部分分布式认证方案，本方案针对群首和普通级别的服务节点设置了不同的部分签名概率，既克服了传统认证需要可信第三方的限制，又提高了系统的安全性和认证效率。更多还原

【Abstract】 Ad hoc network is a collection of mobile computing devices that communicate by using wireless links, forming dynamically a wireless network without the use of any static network infrastructure such as base stations. Such networks are useful in military and other tactical applications, e.g., emergency rescue or exploration missions, where cellular infrastructure is unavailable or unusable. Commercial applications are also likely where there is a need for ubiquitous communication services without the presence or use of a fixed infrastructure including on-the-fly conferencing applications, sensors, etc.Other than traditional network, Ad hoc network has no fixed infrastructure, so the centralized Certificate Authority services in fixed infrastructure networks are no longer suitable for this network. By introducing a policy of trust decentralization, we apply the thought of the cluster model and the probability weight rule into the partially distributed Authentication scheme to distribute the Certificate Authority services into the network .Then we simulate the clustering algorithm of partially signature probability. Compared with traditional partially distributed Authentication scheme, it adds the cluster head and common server nodes a distinct partially signature probability that reflects the security ranks. This scheme overcomes the limit of traditional Certificate Authority services which need trusted third party, the security and authentication efficiency of the system is enhanced as well.更多还原