Analysis and Comparison of Cryptographic Techniques in E-voting and E-auction

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  • 許 容碩
    九州大学大学院システム情報科学府情報工学専攻
  • 今本 健二
    九州大学大学院システム情報科学府情報工学専攻
  • 櫻井 幸一
    九州大学大学院システム情報科学研究院情報工学部門

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Recently, many cryptographic techniques have been used for secure e-voting systems and e-auction systems. In this paper, we compare the used cryptographic techniques of e-voting systems with those of e-auction systems. We analyze advantages and disadvantages of various cryptographic techniques through e-voting systems and e-auction systems. Also, we discuss receipt-freeness which is one of the important requirements in e-voting systems and e-auction systems. Several receipt-free schemes have been proposed to prevent a vote-coercion (e-voting) or a bid-rigging (e-auction). In this paper, we analyze the existing receipt-free schemes and point out that the existing receipt-free schemes for the e-auction system do not prevent the bid-rigging. Moreover, we show the simulation results of computational costs in e-voting systems and e-auction systems which used the similar cryptographic techniques.

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