Receipt - free Electronic Voting throughCollaboration of Voter and Honest

In this paper, we propose a new electronic voting scheme which guarantees receipt-freeness as well as privacy, universal veriiability and robustness. The result of Cramer, Gennaro, and SchoenmarkerssCGS97] proposed at Eurocrypt'97 seems to be promising because it provides optimal performance , privacy, robustness, and universal veriiability. But in their scheme, receipt-freeness was left as an open problem. The failure of receipt-freeness in CGS97] comes from the fact that the ballot is generated and posted on the bulletin board wholly by the voter. To add receipt-freeness to CGS97] while keeping other useful properties, we introduce a trusted third party called honest veriier(HV). In the proposed electronic voting scheme, the voter and HV collaborate through an interactive voting protocol to generate a ballot and it's proof of validity. Finally the vote and it's proof of validity are posted on the bulletin board.