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Vote-Independence: A Powerful Privacy Notion for Voting Protocols

Jannik Dreier 1 Pascal Lafourcade 2 Yassine Lakhnech 3
1 CASSIS - Combination of approaches to the security of infinite states systems
FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174), Inria Nancy - Grand Est, LORIA - FM - Department of Formal Methods
Abstract : Recently an attack on ballot privacy in Helios has been discovered, which is essentially based on copying other voter’s votes. To capture this and similar attacks, we extend the classical threat model and introduce a new security notion for voting protocols: Vote-Independence. We give a formal definition and analyze its relationship to established privacy properties such as Vote-Privacy, Receipt-Freeness and Coercion-Resistance. In particular we show that even Coercion-Resistant protocols do not necessarily ensure Vote-Independence.
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Jannik Dreier, Pascal Lafourcade, Yassine Lakhnech. Vote-Independence: A Powerful Privacy Notion for Voting Protocols. [Technical Report] VERIMAG UMR 5104, Université Grenoble Alpes, France. 2011. ⟨hal-01338071⟩

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