Abstract:

When mobile station (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 integrated scheme based on some previous work is proposed, in which only GPRS AKA operation is performed and IMS can authenticate MS using the result of GPRS authentication. At the same time, the scheme can meet the requirements of MS authenticating IMS and key distribution. Feasibility and performance is analyzed.

Key words: general packet radio service, IP multimedia core network subsystem;authentication and key agreement