Abstract
Mu and Varadharajan proposed an electronic voting system which can be utilized in large-scale elections in 1998. Recently, Lin et al. showed that Mu and Varadharajan's scheme has a weakness. That is, voters can successfully vote more than once without being detected. To avoid this weakness, Lin et al. proposed a modified scheme. However, this paper shows that the Lin et al.'s modification allows the Authentication Server to identify the voters of published tickets so that voters will lose their privacy. An improved scheme is further proposed to solve this problem and thus enhance the security.
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