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3G系统安全框架采用了3GPP组织建议的AKA协议机制,并对无线链路上传输的数据进行加密保护,对传送的信令消息进行完整性保护。比2G系统在无线空中接口的安全性上有了很大的提升。但是,自从AKA协议提出后,国外许多学者就对该协议进行了研究,提出了该协议存在的许多安全问题,同时给出了许多改进AKA的建议。采用一种协议元素机密性推导方法分析了3GPP AKA和改进型AKA的安全性,提出了改进型AKA存在的安全薄弱点,并提出了改进协议的方法。
The 3G system security framework adopts the AKA protocol mechanism proposed by the 3GPP organization, and encrypts the data transmitted on the wireless link to protect the integrity of the transmitted signaling messages. Than the 2G system in the wireless air interface security has been greatly improved. However, since the AKA protocol was proposed, many foreign scholars have studied the protocol, proposed many security issues of the protocol, and provided many suggestions for improving the AKA. This paper analyzes the security of 3GPP AKA and AKA by adopting a confidential derivation method of protocol elements, puts forward the security weak points existing in the improved AKA, and proposes a method to improve the protocol.