IEEE 802.11r 기반의 무선랜에서 재인증 요청을 이용한 개선된 고속 핸드오버 방법 = Design and Implementation of Pre-authentication Method for Fast Mobility Support in WLAN

다국어 초록 (Multilingual Abstract)

According as wireless LAN system based on IEEE 802.11, interest about security and mobility support for mobile devices is increased day by day. However, the IEEE 802.11i which is the present wireless LAN security standard takes average hundreds ms for user authentication. So it is not suitable for realtime multimedia service like VoIP. To supplement this, IEEE approved new standard IEEE 802.11r that support "Fast BSS Transition" and QoS guarantee with resource reservation.
IEEE 802.11r supports Fast BSS ( Basic Service Set ) Transition by skipping IEEE 802.1X procedure and the pre-authentication request with simplified 4-Way handshake in the same mobility domain. However, if the handover does not occur within the reassociation deadline time, IEEE 802.11r repeats 802.1X authentication and association process again.
In this paper, we prevent this problem and improve the performance of the fast speed handover based on IEEE 802.11r standard by sending re-authentication request message again.

목차 (Table of Contents)

• Ⅰ. 서론 = 1
• Ⅱ. 무선랜 보안 및 관련 연구 = 3
• 1. 무선랜 보안요소 = 3
• 2. 관련 표준 = 6
• 2.1 IEEE 802.1X = 6
• 2.2 IEEE 802.11i = 7
• 2.3 IEEE 802.11r = 9
• 2.3.1 IEEE 802.11r의 구성요소 = 9
• 2.3.2 IEEE 802.11r의 기본 동작 과정 = 12
• 3. 고속 사용자 인증기법 관련 연구 = 14
• 3.1 IEEE 802.11i 사전인증 및 키 캐싱 = 14
• 3.2 Frequent Handoff Region (FHR) 기법 = 16
• 3.3 Proactive Key Distribution (PKD) 기법 = 17
• Ⅲ. 802.11r 성능개선을 위한 재인증 메커니즘의 설계 = 19
• 1. IEEE 802.11r의 문제점과 해결방안 = 19
• 2. 고속 핸드오버 지원을 위한 제안구조 = 28
• 3. 제안구조 흐름도 = 31
• 4. 고속 핸드오버 지원을 위한 재인증 메커니즘 설계 = 34
• 4.1 Station 설계 = 35
• 4.1.1 Key Management Module = 35
• 4.1.2 Handover Management Module = 35
• 4.1.3 FT Management Module = 36
• 4.1.4 Re-Authentication Request Timer Module = 36
• 4.1.5 Socket Interface = 37
• 4.2 Authentication Server 설계 = 37
• 4.2.1 Information Storage = 37
• 4.2.2 Mobility Domain Management Module = 38
• Ⅳ. 성능 평가 및 분석 = 40
• 1. 실험환경 = 40
• 2. 성능평가 = 42
• Ⅴ. 결론 = 44
• 참고문헌 = 46