基于半信任模型的无收据的电子投票

Receipt-Free Electronic Voting Based on Semi-Trusted Model

利用同态ElGamal加密、门限ElGamal加密和同指数知识证明等技术 ,给出了一种无收据的电子投票方案 .该方案同时保证了选票的秘密性、广义可验证性和公平性 .与以前协议不同的是 ,所提的方案基于半信任模型 ,即投票者不必无条件地信任所谓的“可信赖第三方” .文中首先给出了“半信任”的定义 ,然后证明了所提方案在半信任模型下该方案仍然满足无收据性 ,从而防止了选举中的“选票买卖”、“强迫选举”等犯罪行为 .

A receipt-free electronic voting scheme is proposed by using the techniques of homomorphic ElGamal encryption, threshold encryption and proof of knowledge. It guarantees privacy, universal verifiability, and fairness. Different from the previous protocols, the proposed scheme is based on semi-trusted model, i.e., voters need not to trust the so-called trusted third party entirely. Firstly the definition of trust is given, and then it is proved that the proposed scheme guarantees receipt-free on semi-trusted model which can prevent the crimes of voting such as vote buying, coercible vote etc.