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Safe Voting: Resilience to Abstention and Sybils
Reshef Meir, Gal Shahaf, Ehud Shapiro, Nimrod Talmon · 2020-01-15 · via cs.SI updates on arXiv.org

Voting rules may implement the will of the society when all eligible voters vote, and only them. However, they may fail to do so when sybil (fake or duplicate) votes are present and when only some honest (non sybil) voters actively participate. As, unfortunately, sometimes this is the case, our aim here is to address social choice in the presence of sybils and voter abstention. % To do so, we build upon the framework of Reality-aware Social Choice: we assume the status quo as an ever-present distinguished alternative, and study \emph{status quo Enforcing (QUE) voting rules}, which add virtual votes in support of the status quo. We characterize the tradeoff between \emph{safety} and \emph{liveness} (the ability of active honest voters to maintain/change the status quo, respectively) in several domains, and show that the voting rules are often optimal. \revision{Our characterization identifies the exact conditions under which mechanisms remain both resilient to sybils and responsive to verified participation, offering a quantitative tool for designers to measure the benefit of increased participation and verified identities.