近年来，3GPP长期演进（LTE）项目已成为当前4G无线通信系统的主流技术。相对于3G，LTE在接入安全方面做出了很大改进，安全性亦得到提升，然而仍存在着一些安全问题。重点分析了LTE认证与密钥协商协议（EPS AKA）流程中的安全问题，关键信息的明文传送问题、公共密钥泄露问题等。针对这些安全问题提出了相应的改进方案，对其进行了安全性分析。%In recent years,LTE(long term evolution)has become one of the mainstreams of current wireless communica-tion systems. Compared with 3G,LTE makes a great improvement in the access security,but still has some security issues. The security,plaintext transmission of the key information and the public key exposure issues existing in flow path of LTE authentica-tion and key agreement protocol(EPS AKA)are analyzed emphatically in this paper. Some improving schemes are proposed for these security issues,and their security is analyzed.
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