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A special membership proof technique is applied to the efficiency bottleneck of homomorphic e-voting, vote validity check. Although the special membership proof technique has some limitations such that so far few appropriate applications have been found for it, it is suitable for homomorphic e-voting. As so far no efficient and secure solution has been found for vote validity check in homomorphic e-voting, this new method is very useful. It greatly improves efficiency of homomorphic e-voting.