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Computers & Electrical Engineering

Two efficient two-factor authenticated key exchange protocols in public wireless LANs

Wen-Shenq Juang, Jing-Lin Wu

Published Jun 10, 2008• 44 citations
Publisher
DOI
10.1016/j.compeleceng.2008.03.002

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In 2010, Fan et al. proposed a Smart Card-Based Authenticated Key Exchange protocol with CAPTCHAs for wireless mobile networks. In this paper, it is shown that their proposed protocol is vulnerable to Key Compromise Impersonation (KCI) and ephemeral key compromise impersonation attacks while it does not provide the key confirmation attribute. Furthermore, it is inefficient due to number redundancy of rounds and computational costs. To overcome these weaknesses, two secure and efficient smart card-based Authenticated Key Exchange (AKE) protocols combined with CAPTCHAs are proposed for wireless mobile networks that provide many security attributes while they have a remarkable efficiency when compared with Fan et al.'s protocol in the terms of communication costs and computational complexities.
We propose two public-key schemes to achieve deniable authentication for the Internet Key Exchange (IKE). Authentication in security had is the essential factor in the key establishment over Internet. The Deniable Internet key exchange protocol gives more value to the IKE standard. Our schemes can in some situations be more efficient than existing IKE protocols as well as having stronger deniability properties. Key-exchange, in particular Diffie–Hellman key exchange (DHKE), is among the core cryptographic mechanisms for ensuring network security. For key-exchange over the Internet, both security and privacy are desired. In this paper, we develop a family of privacy-preserving authenticated DHKE protocols named deniable Internet key-exchange (DIKE), both in the traditional PKI setting and in the identity-based setting. The newly developed DIKE protocols are of conceptual clarity and practical (online) efficiency. They provide useful privacy protection to both protocol participants, and add novelty and new value to the IKE standard.