中文摘要：

无线自组网络是一种不需要基础通信设施的自组织网络，正得到越来越多的应用．当前自组网络的安全性研究正成为一个热点．对基于簇结构的自组网络进行了安全分析，并且针对存在的安全问题提出了新的安全解决方案．主要贡献在于：①提出了一个保护簇首的安全机制；②针对节点簇间漫游的安全隐患，提出一个基于请求的节点信息共享机制，并给出了相应的算法．对该方案进行了仿真实验，结果显示，该方案具有充分的可行性．与已有方案相比，该方案具有较完善的安全机制，网络性能也较好．

英文摘要：

Wireless ad hoc networks are a kind of networks that do not need communication infrastructure. Such networks are being used in more and more areas. The security of ad hoc networks has become a hot research point in the latest years. The security of cluster based ad hoc networks is analyzed and a new scheme is proposed to solve the security problems existing in such networks. The main contributions of the scheme are as follows： （1）presenting a security mechanism to secure the cluster heads; and （2） proposing a mechanism to remove the security defects in the roaming of mobile nodes, and providing a related algorithm. Simulation is performed to test the scheme. The experiment results show that the scheme is feasible. Compared with related security schemes for cluster based ad hoc networks, the proposed scheme is more secure, and has a better network performance.