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In recent years, several electronic voting (e-voting) schemes for communication networks have been proposed. In 2006, Chang and Lee presented an anonymous electronic voting scheme which can be applied in real-world elections. However, this paper shows that Chang-Lee's e-voting scheme suffers from susceptibility to security attacks. As a result, some essential security requirements of their e-voting scheme may be compromised. An improved scheme is suggested to enhance the security of their scheme. In this paper, the authors have shown that Chang-Lee's e-voting scheme is vulnerable to some attacks and the essential requirements of general electronic voting cannot be achieved in their scheme. They propose an improvement on Chang-Lee scheme to solve these problems and demonstrate that it is suitable for e-voting applications with high security requirements.
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