Security Analysis on Wireless LAN protocols
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1 Security Analysis on Wireless LAN protocols HORI Yoshiaki Kyushu University / ISIT ETRI-ISIT 1st joint seminar 1
2 Contents ETRI-ISIT 1st joint seminar 2
3 Wireless LAN and Security Wireless LAN (WLAN) WLAN uses wireless media instead of wired media in order to provide connectivity for a terminal. A wireless terminal is connected with Access Point (AP) by using of wireless media. WLAN provides mobility, no wire WLAN enables easily to build LAN Currently WLAN become widely deployed. WLAN security WLAN security has become a serious concern for many organizations. Security requirements for a WLAN Data condidentiality Integrity Mutual authentication Availability ETRI-ISIT 1st joint seminar 3
4 WLAN security model Wireless terminal (Supplicant) Access Point (AP) (Authenticator) Network Attack Eaves dropping (Authentication Server) Adversary ETRI-ISIT 1st joint seminar 4
5 Wireless Threats (by C. He and J. C. Mitchell, Stanford Univ.) Wireless Threats Threat 1: Passive Eavesdropping Threat 2: Message Injection Threat 3: Message Deletion and Interception Threat 4: Masquerading and Malicious AP Threat 5: Session Hijacking Threat 6: Man-in-the-Middle Threat 7: Denial of Service Threats 1, 2, and 3: attack all three type of frames in the Link Layer Threats 4, 5, and 6: defeat mutual authentication Threats 7: interferes with availabilit ETRI-ISIT 1st joint seminar 5
6 IEEE i overview ETRI-ISIT 1st joint seminar 6
7 Data confidentiality and Integrity ETRI-ISIT 1st joint seminar 7
8 Authentication and Key Management ETRI-ISIT 1st joint seminar 8
9 Availability ETRI-ISIT 1st joint seminar 9
10 Known DoS Attacks ETRI-ISIT 1st joint seminar 10
11 Summary: i security ETRI-ISIT 1st joint seminar 11
12 MIS Protocol IP MIS protocol IEEE Pseudo AdHoc mode Protocol Layers ETRI-ISIT 1st joint seminar 12
13 Design and Standardize Some ideas of MIS protocol were written in 2001 Fast Authentication System for Secure Wireless Internet Services (K. Fujikawa, H. Nakano, M. Ohta, M. Hirabaru, H. Mano, and K. Ikeda) IPSJ SIGDPS technical report, 2001-DPS-107, March 2002 Protocol specifications were approved by Mobile Broadband Association (MBA) and published on their Web. Protocol Documents (but these are written in only Japanese) MBA standard 0201, MIS protocol specification ver (announced on April 2004) MBA standard draft 0301, MISAUTH protocol specification (annouced on June 2004) ETRI-ISIT 1st joint seminar 13
14 MIS protocol time chart Mobile Node (MN) s generated k(s) generate beacon Auth. Request Base Router (BR) ( t ) ( s, t, Hk(t) ) Access Request k: Shared Key s: seed t: timestamp Hk(): Keyed Hash Func Authentication Server (AS) ( s, t, Hk(t) ) Hk(s) Hk(s) is shared as session key Auth. success Access O.K. ( Hk(s) ) ETRI-ISIT 1st joint seminar 14
15 Objective ETRI-ISIT 1st joint seminar 15
16 Confidentiality and Integrity ETRI-ISIT 1st joint seminar 16
17 Authentication ETRI-ISIT 1st joint seminar 17
18 Availability ETRI-ISIT 1st joint seminar 18
19 Countermeasure of MIS protocol ETRI-ISIT 1st joint seminar 19
20 Summary ETRI-ISIT 1st joint seminar 20
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