新的移动环境下两轮群组密钥协商协议

随着互联网技术的不断进步，越来越多的领域对群组应用有着大量需求，如电视电话会议、实时信息服务、网络游戏等。无线网络的日渐发展和移动设备的广泛普及，使得人们对群组通信的要求更上一级。如何使得用户在开放的网络环境中生成一个共同的安全的组密钥成为学者们研究的一个热点问题。针对非平衡无线网络环境，首先提出一个新的安全模型，模拟现实环境中敌手通过侧信道攻击等方法得到内存中哈希值的情况或者预计算中哈希函数值保存不当而泄漏的情况，赋予敌手查询临时哈希值的能力；其次，提出了一个新的两轮群组密钥协商协议；最后，在随机预言模型中对该协议进行安全性分析。由于敌手被赋予了更强的能力，新协议较其它同类协议也具有更高的安全性。

New Two Round Group Key Agreement Protocol for Mobile Environment

With the progress of Internet technology, there is an increasing need for group application in such fields as teleconferencing, real time information services and network games. Meanwhile, continuous development of wireless network and popularity of mobile devices bring about higher demands on group communication. Secure group key generation for users in an open network environment has thus become a hot research focus. Firstly, we propose a new security model for the unbalanced wireless network environment. This model assumes that the adversary uses the side channel attack to get the hash value or the adversary could query a temporary hash value due to improper storage in precomputation. Secondly, we put forward a new two round group key agreement protocol. Finally, we analyze the security of the protocol in the random oracle model. Because the adversary is given stronger capacity, the new protocol has higher security than other similar protocols.