| Summary: | 碩士 === 國立中興大學 === 資訊科學研究所 === 92 === In the traditional wired world, the user typically connects each other with a particular service provider by dialing up on the associated network; meanwhile, the service provider routes an authentication to the user’s home domain. In a wireless network, however, the user does not need to choose an access domain, but only to connect access point nearby. Thus the topics of security and authentication should be paid more attention to for WLANs.
Most password-based authentication protocols used in WLANs are designed for a hash of the password with a random challenge. They enhance the privacy with cryptosystem to satisfy the requirement of security. Also, they are implemented easier then the other network protocol and conformed to the behavior of network use.
This paper proposes two password-based authentication protocols according to IEEE standard, which support mutual authentication and key derivation, and take other related security issues into consideration. On the authentication, the proposed protocols lower the computing cost, and enhance user identity privacy support. Additionally, the fast re-authentication mechanism reduces network traffic in the authentication flow. Finally, comparisons of security are made between the proposed protocols and the current protocols, no matter password-based or certificate-based.
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