中文摘要：

针对4G认证与密钥协商协议（EPSAKA）中存在的安全问题，提出了一种高效安全的改进协议（ES—AKA）．该协议不仅能够抵抗重定向攻击和重放攻击，同时消除了密钥K泄露的安全隐患．安全性和协议性能分析表明：在更高的安全性能下，该协议降低了服务网络的存储空间和归属网络的计算量，有效减少了认证过程的比特通信量．

英文摘要：

For security flaws in 4G authentication and key agreement protocol, an efficient and secured authentication and key agreement （ES-AKA） protocol was proposed. This protocol resists redirection at- tack and replay attack, solves security risks that key K is possible leaked. Analyzing of the security and efficiency of ES-AKA shows that ES-AKA could reduce not only the storage of service network but also the computation of home network, and has less bit exchange traffic in higher security environment.