GPRS与IMS认证及密钥分配优化方法

移动用户通过通用分组无线业务(GPRS)接入IP多媒体子系统(IMS)时,GPRS和IMS都会对移动用户进行认证和密钥分配,操作过程类似,通信开销大,缺乏效率。为解决该问题,结合相关研究成果,提出一种优化方法,该方法可只进行GPRS的认证与密钥分配(AKA)协议操作,IMS基于GPRS的认证结果实现了对移动用户的认证。同时给出了该优化方案的可行性分析。

Optimized Procedure of Authentication and Key Agreement for GPRS and IMS

When mobile subscriber(MS) accesses into IP multimedia core network subsystem(IMS) through general packet radio service(GPRS),the MS should perform authentication and key distribution operations in protocol authentication and key agreement(AKA) at both GPRS and IMS level.The two operations are very similar,so it is very inefficient to perform twice independently.To solve the problem,an optimized scheme based on some previous work was proposed,in which only GPRS AKA operation was performed and IMS could authenticate MS using the result of GPRS authentication.And it was proved that the one-pass procedure correctly authenticates the IMS users.