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The number of wireless public network user is increasing rapidly. Security problem for user authentication is risen on existing wireless network such as 802.11 based Wireless LAN. As a solution, 802.1x (EAP-MD5, EAP-TLS, EAP-TTLS), X.509, protocol or security system was developed by effective disposal plan of this problem. In this study, we overview main problem of existing EAP-MD5 authentication mechanism and propose a SMS based secure authentication mechanism for providing security enhanced wireless network.