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2015 IEEE Symposium on Security and Privacy (SP) (2015)
San Jose, CA, USA
May 17, 2015 to May 21, 2015
ISSN: 1081-6011
ISBN: 978-1-4673-6949-7
pp: 499-516
We critically survey game-based security definitions for the privacy of voting schemes. In addition to known limitations, we unveil several previously unnoticed shortcomings. Surprisingly, the conclusion of our study is that none of the existing definitions is satisfactory: they either provide only weak guarantees, or can be applied only to a limited class of schemes, or both. Based on our findings, we propose a new game-based definition of privacy which we call BPRIV. We also identify a new property which we call strong consistency, needed to express that tallying does not leak sensitive information. We validate our security notions by showing that BPRIV, strong consistency (and an additional simple property called strong correctness) for a voting scheme imply its security in a simulation-based sense. This result also yields a proof technique for proving entropy-based notions of privacy which offer the strongest security guarantees but are hard to prove directly: first prove your scheme BPRIV, strongly consistent (and correct), then study the entropy-based privacy of the result function of the election, which is a much easier task.
data privacy, game theory, politics

D. Bernhard, V. Cortier, D. Galindo, O. Pereira and B. Warinschi, "SoK: A Comprehensive Analysis of Game-Based Ballot Privacy Definitions," 2015 IEEE Symposium on Security and Privacy (SP), San Jose, CA, USA, 2015, pp. 499-516.
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