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Verifiability, Privacy, and Coercion-Resistance: New Insights from a Case Study

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3 Author(s)
Ku╠łesters, R. ; Univ. of Trier, Trier, Germany ; Truderung, T. ; Vogt, A.

In this paper, we present new insights into central properties of voting systems, namely verifiability, privacy, and coercion-resistance. We demonstrate that the combination of the two forms of verifiability considered in the literature -- individual and universal verifiability -- are, unlike commonly believed, insufficient to guarantee overall verifiability. We also demonstrate that the relationship between coercion-resistance and privacy is more subtle than suggested in the literature. Our findings are partly based on a case study of prominent voting systems, Three Ballot and VAV, for which, among others, we show that, unlike commonly believed, they do not provide any reasonable level of verifiability, even though they satisfy individual and universal verifiability. Also, we show that the original variants of Three Ballot and VAV provide a better level of coercion-resistance than of privacy.

Published in:

Security and Privacy (SP), 2011 IEEE Symposium on

Date of Conference:

22-25 May 2011