Ad hoc网络的密钥管理技术是影响Ad hoc网络发展的重要因素，本文对Ad hoc现存密钥管理技术进行了研究。在基于身份密码系统的基础上，提出了UCKG（User Contributed Key Generation）密钥生成策略及分布式密钥管理协议，克服了身份密码系统存在PGC欺骗以及需要安全信道分发密钥的缺陷。对UCKG分布式密钥管理协议使用NS工具进行了性能仿真，当网络具有较好的连通性时，提出的密钥管理协议具有较好的性能。

Key management protocol is a key problem for Ad hoc network security. In this paper, we introduced a user contributed key generation strategy (UCKG) based on the identity based cryptography (IBC). Compared to IBC key generation strategy, UCKG has no PGC-cheating problem and no requirement of secure channel for key distribution. We also proposed a distributed key management protocol for UCKG and simulated it with NS-2. The simulation results show that while the network had the good connectivity, the distributed key management protocol has good performance.