随着移动通信的发展,通信网络中安全问题也日益严重。LTE与UMTS和GSM一同提供了一种相似的安全性。本文首先介绍了安全性中的认证和密钥协商进程,然后对LTE系统中的密钥产生体系和使用流程进行了分析,着重对接入层的安全模式命令进行阐述,最后总结了LTE中两大安全性功能的实现方案。 With the development of mobile communication, security problems in the communication network are also increasingly serious. LTE offers a similar kind of security along with UMTS and GSM. This paper first introduces the authentication and key agreement process in security, and then analyzes the key generation system and the usage process in LTE system. The emphasis is put on the security mode commands at the access layer. Finally, Large security features to achieve the program.