| Summary: | 碩士 === 靜宜大學 === 資訊管理學系研究所 === 92 === Because of the transmitting characteristics of airwaves, the safety of wireless networks brings more threat than wired networks do. Among all the essential security, such as authentication, privacy and not-repudiation, authentication is considered the most important. In this paper, we study the existing authentication mechanisms in wireless local area networks (WLAN). And propose a cost-effective WLAN Mutual Authentication Mechanism. Our mechanism adopt the remote password authentication system as the framework and use Shamir’s “Identity-Based Signature Scheme”, Schnorr’s “Identification Scheme” and Deffie Hellman’s “Key Exchange Scheme”, to achieve the mutual authentication between users and AP. The system not only reduces the usage of RADIUS server in IEEE 802.1X, but also provides a solution to “man in the middle attack.” In addition, time stamps is used for preventing replay attack.
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