Abstract: Based on secure sum with semi-honest assumption, an improved voting scheme is proposed, which is more secure and efficient. Contrasted with previous literature, the improved scheme is completely secure when the number of colluders is no more than [n-1]. Every voter determines its ticket with random number without multi-precision arithmetic, which makes the scheme more efficient.

Key words: secure multi-party sum, semi-honest model, electronic vote, unanimous election

摘要： 基于半诚信模型下的安全多方求和，提出了一种安全高效的一票否决电子选举方案，除了满足电子选举应满足的一般性质外，与以前方案相比，当合谋人数小于[n-1]时，该方案满足选票的完全保密性。方案中，每个投票人可以灵活地应用随机数来确定自己的选票形式，不需要做多精度运算，使得方案具有更高的计算效率。

关键词: 安全多方求和, 半诚信模型, 电子选举, 一票否决