IACR News item: 23 February 2014
Ding Wang, Ping Wang, and Debiao He
ePrint ReportIn this work, we attempt to provide an answer to this question. We revisit two latest (and reprentative) proposals, i.e. Xie\'s scheme and Li\'s scheme, and explore some inherent conflicts and unavoidable trade-offs in designing such schemes. Our results highly indicate that, under the current widely accepted adversary model, certain goals are beyond attainment. To the best of knowledge, the present study makes the first step towards understanding the underlying evaluation metric for dynamic id-based two-factor authentication, which we believe will facilitate better design of two-factor protocols that offer acceptable trade-offs between usability, security and privacy.
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