Ad Hoc networks can quickly put up a wireless mobile communication network without conventional network infrastructures. However, its flexible characteristics make security a challenge. Key management is central to ensuring privacy protection in Ad Hoc networks. Following the analysis of existing distributed trust model to Ad Hoc networks, this paper proposes an effective key management scheme based on cluster. The scheme achieves two-way authentication between the nodes, with strong capability of anti-counterfeiting attack. The process of key distribution is simple and the overhead of computation and communication is lower. The performance of simulations shows that the scheme is secure and effective; the scheme is suited to the self-organized and resource-constrained features of Ad Hoc networks.%Ad Hoc网络可以不依赖于现有网络基础设施,快速搭建起一个移动通信网络,然而其灵活性又使其安全性面临着严峻的挑战.密钥管理是Ad Hoc网络安全的关键技术,在分析现有的Ad Hoc网络分布式信任方案基础上,提出一种有效的基于簇的密钥管理方案.该方案实现了节点之间的双向认证,具有较强的抗假冒攻击能力,密钥分发过程简单,计算量和通信量都比较小.仿真结果表明,该方案安全高效,适合Ad Hoc网络自组织和资源受限的特点.
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