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The first electronic election mechanism enables people to electronically cast his/her ballot over insecure network. Recently, Chang and Lee presented an anonymous electronic voting (e-voting) scheme based on the key exchange protocol. Unfortunately, in this paper, the authors found that Chang-Lee's e-voting scheme suffers from susceptibility to security attacks and some critical security requirements of their e-voting scheme may be compromised. As a result, an improved version on their scheme is proposed to enhance the security of their scheme.
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