As the mobile network progresses fast, mobile communications have a far‐reaching influence in our daily life. In order to guarantee the communication security, a myriad of experts introduced many authentication protocols. Recently, Qi et al presented an enhanced authentication with key agreement protocol for satellite communications, and they proclaimed that their protocol could defend various attacks and support varied security requirements. Regrettably, in this paper, we prove that their protocol was fruitless in resisting smart card stolen or loss attack, supporting perfect forward secrecy and had a fundamental error. To solve these problems, we present an improved protocol based on perfect forward secrecy. In addition, the analysis of our improved protocol suggests that it gets possession of faultless security properties and overcomes the flaws in the protocol of Qi et al perfectly. Thus, our improved protocol can be appropriated for the mobile communications.

中文翻译：

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一种改进的基于完美前向保密性的相互认证协议，用于卫星通信

随着移动网络的快速发展，移动通信在我们的日常生活中具有深远的影响。为了保证通信的安全性，无数的专家介绍了许多认证协议。最近，Qi等人提出了一种用于卫星通信的带有密钥协议的增强型身份验证协议，他们宣称自己的协议可以防御各种攻击并支持各种安全要求。遗憾的是，在本文中，我们证明了它们的协议在抵抗智能卡被盗或丢失攻击，支持完美的前向保密性并具有基本错误方面无能为力。为了解决这些问题，我们提出了一种基于完善的前向保密性的改进协议。此外，对我们改进协议的分析表明，该协议具有完美的安全性，可以完美地克服Qi等人协议中的缺陷。因此，我们改进的协议可以适用于移动通信。