Abstract: To obtain the target of network communication exist in every where，We must research on Ad hoc network.In Ad hoc network，to ensure secure communication of each ad hoc network node，We must authenticate each node’s identity within the network.In this paper，we summarize some authentication mechanisms of Ad hoc network security in recent years.We conclude security authentication mechanism based on symmetric cryptography algorithm and asymmetric cryptography algorithm respectively，and then summarize the conclusion based on the evaluation of these security mechanisms.

Key words: Ad hoc network, algorithm for message authentication, algorithm for entity authentication

摘要： 要达到网络通信无处不在目的，必须研究Ad hoc网络。在Ad hoc网络中，要保证Ad hoc网络各节点间的安全通信，必须对组成网络的各节点身份进行认证。对近几年Ad hoc网络安全研究中的组成网络各节点身份进行认证的机制进行了综述，归纳出基于对称密码算法和非对称密码算法的安全认证机制，并对这些机制进行评估。

关键词: Ad hoc网络, 消息认证算法, 实体认证算法