NDLI: Analysis of the 802.11i 4-way handshake

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Analysis of the 802.11i 4-way handshake

Content Provider	ACM Digital Library
Author	He, Changhua Mitchell, John C.
Abstract	802.11i is an IEEE standard designed to provide enhanced MAC security in wireless networks. The authentication process involves three entities: the supplicant (wireless device), the authenticator (access point), and the authentication server (e.g., a backend RADIUS server). A 4-Way Handshake must be executed between the supplicant and the authenticator to derive a fresh pairwise key and/or group key for subsequent data transmissions.We analyze the 4-Way Handshake protocol using a finite-state verification tool and find a Denial-of-Service attack. The attack involves forging initial messages from the authenticator to the supplicant to produce inconsistent keys in peers. Three repairs are proposed; based on various considerations, the third one appears to be the best. The resulting improvement to the standard, adopted by the 802.11 TGi in their final deliberation, involves only a minor change in the algorithm used by the supplicant.
Starting Page	43
Ending Page	50
Page Count	8
File Format	PDF
ISBN	158113925X
DOI	10.1145/1023646.1023655
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-10-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Authentication Wlan Key management 802.11i 4-way handshake Denial-of-service
Content Type	Text
Resource Type	Article

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