無收據式電子投票機制

Abstract

當一群人想要在開放式的網路架構上，進行網路電子投票的行為，以求得在他們之中，能做出一個大多數人都同意的決定或選擇；此時就必須存在一個完整的電子投票機制，來保護參與投票者其投票時的私密性（privacy）與達到整個投票系統的強固性（robustness）、可公開驗證性（universal verifiability）與公平性等的特性要求。 但在以往所提出的相關電子投票機制中，雖然大多數都能夠達到上述的種種要求，卻都還是會存在著一些問題，那就是會發生買票、賣票與投票暴力等的行為發生。因為在以往的許多機制中，都會讓投票者可留下一個投票收據（receipt）；利用此收據可用來證明投票者所投出的選票內容為何，而造成選舉的不公平性。為了解決這個問題，本篇論文的主要研究成果即是提出多重投票中心（multi-aurhority）的無收據式電子投票機制；使其不但能達到上述種種特性的要求，同時還具備有無投票收據性（receipt-freeness），更進一步的來保護投票者不會受到買票者或投票脅迫者的威脅，同時也增加了整個投票系統的公平性。

When some members want to make a decision or a choose at large of them via an open Internet . Then , they will need a completely electronic voting scheme to protect voters’ privacy and achieve the voting system’s robustness , universal verifiability , and fairness , etc . Most of the electronic voting schemes that proprsed in the past , although they can achieve above properties , but , still exist some problems. That is , they will occur vote-buying event or vote-coercers’ violence . Because these schemes will let voters get a receipt about his vote , and this receipt can prove to another one what his vote is . In order to solving this problem , this thesis’s fruitful research result is to propose multi-authorities receipt-free voting schemes . And let them not only can achieve above voting requirements but also can achieve receipt-freeness property of a voting system. Furthermore, it giving voters more protection and the voting system more fairness .