Koenig, Reto E.Dubuis, EricHaenni, RolfKrimmer, RobertGrimm, Rüdiger2019-01-172019-01-172010978-3-88579-261-1https://dl.gi.de/handle/20.500.12116/19497In this paper, we demonstrate that e-voting protocols based on threshold blind signatures from multiple authorities allow a coalition of eligible voters to cast more than votes. This property presents a serious violation of the principles of democracy in the voting process. We analyze the applicability of this violation and provide a generic solution using a public registration board and modified threshold signature schemes.enWhy public registration boards are required in E-voting systems based on threshold blind signature protocolsText/Conference Paper1617-5468