Ad Hoc网络是一种独具特色的网络,作为一种新型的无线、多跳、无中心分布式控制网络,它无需网络基础设施,具有很强的自组织性、鲁棒性、抗毁性和容易构建的特点,其安全问题一直是研究的热点和难点。文中提出了一种改进的基于椭圆曲线密码组合公钥的ad hoc密钥管理方案。与原方案相比,除了保持快捷地计算出节点的公私钥对、扩展性好、无需证书等特性外,新方案进一步提高了ad hoc网络的安全性,避免了单点失败。 Ad Hoc network is a unique network, as a new type of wireless, multi-hop, decentralized distributed control network, it does not require network infrastructure, with strong self-organization, robustness, survivability And easy to build features, the security issue has been the hot and difficult research. In this paper, an improved ad hoc key management scheme based on elliptic curve cryptography combined public key is proposed. Compared with the original scheme, in addition to keeping the public-private key pairs of the nodes fast, scalability and certificate-free features, the new scheme further improves the security of ad hoc networks and avoids single-point failures.