隨著無線網路技術的快速發展，現今的行動電信網路和IEEE802.11技術的無線區域網路(Wireless Local Area Network)，這兩個異質性的網路之整合將是一個趨勢。因此3GPP組織制定規劃了不同等級的整合階段，而目前雙網整合發展到邁入等級三的階段，其中在等級三中引進一個新的節點名為Packet Data Gateway(PDG)，它是用來輔助使用者能夠在Wireless Local Area Network(WLAN)下，去存取行動電信網路內部的數據服務。而在此種應用情形下，使用者必須先經過WLAN階段的認證，然後再做PDG階段的認證。然而我們發現這兩個認證中有部份動作是重複且多餘的，因而我們提出一個較為簡易的認證方法來做PDG部分的認證動作，並模擬架設出雙網整合的實驗環境，包含WLAN、3GPP電信網路和IP Multimedia Subsystem(IMS)網路，來實驗測試本論文的方法和原本的方法效能的差異性。最後並以列舉出數個常見的網路攻擊行為，來探討本論文的方法是否能有效避免，而達到安全性方面也與原本方法相同的保障。

[1] 3GPP TS 29.234: 3GPP System to Wireless Local Area Network Interworking.
[2] S.Kent BBN Corp R.Atkinson “Security Architecture for the Internet Protocol” RFC 2401 , Nov 1998
[3] C. Kaufman, Ed. Microsoft “Internet Key Exchange (IKEv2) Protocol
“ RFC 4306 , December 2005
[4] B. Aboba Microsoft , L. Blunk Merit Network, Inc ,J. Vollbrecht Vollbrecht Consulting LLC J. Carlson Sun , H. Levkowetz, Ed. ipUnplugged“Extensible Authentication Protocol (EAP)” RFC 3748 , June 2004
[5] H.Haverinen , Ed.Nokia J. Salowey , Ed.Cisco Sysyems “Extensible Authentication Protocol Method for Global System for Mobile Communications (GSM) Subscriber Identity Modules (EAP-SIM)”RFC 4186 , January 2006
[6] C. C. Yang, K. H. Chu and Y. W. Yang, “3G and WLAN Interworking Security: Current Status and Key Issues”, International Journal of Network Security, Vol. 2, No. 1, Jan 2006, pp 1-13.
[7] H. Krawczyk IBM ,M. Bellare UCSD ,R. Canetti IBM "HMAC: Keyed-Hashing for Message Authentication" RFC 2104, February 1997
[8]“SIP: Session Initiation Protocol” RFC 3261 , June 2002
[9] Yi-Bing Lin, Ming-Feng Chang, Meng-Ta Hsu, and Lin-Yi Wu “One-Pass GPRS and IMS Authentication Procedure for UMTS” IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 23, NO. 6, JUNE 2005
[10] 3GPP TS 33.234: Wireless Local Area Network (WLAN) Interworking Security
[11] 3GPP TS 23.234: 3GPP System to Wireless Local Area Network (WLAN) Inter-working System Description.
[12] 3GPP TR 23.937 : Feasbility study of mobility between 3GPP-WLAN interworking and 3GPP systems
[13] James F. Kurose , Keith W. Ross “computer networking A Top-Down Approach Featuring the Internet” Third Edition