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Many cryptographic tasks and protocols, such as non-repudiation, contract-signing, voting, auction, identity-based encryption, and certain forms of secure multi-party computation, involve the use of (semi-)trusted parties, such as notaries and authorities. It is crucial that such parties can be held accountable in case they misbehave as this is a strong(More)
Verifiability is a central property of modern e-voting systems. Intuitively, verifiability means that voters can check that their votes were actually counted and that the published result of the election is correct, even if the voting machine/authorities are (partially) untrusted. In this paper, we raise awareness of a simple attack, which we call a clash(More)
—Coercion-resistance is one of the most important and intricate security requirements for voting protocols. Several definitions of coercion-resistance have been proposed in the literature, both in cryptographic settings and more abstract, symbolic models. However, unlike symbolic approaches, only very few voting protocols have been rigorously analyzed(More)
—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(More)
Recently, K ¨ usters, Truderung, and Vogt have proposed a simple, yet widely applicable and formal definition of coercion-resistance for voting protocols, which allows to precisely quantify the level of coercion-resistance a protocol provides. In this paper, we use their definition to analyze coercion-resistance of Scantegrity II, one of the most prominent(More)
Mix nets with randomized partial checking (RPC mix nets) have been introduced by Jakobsson, Juels, and Rivest as particularly simple and efficient verifiable mix nets. These mix nets have been used in several implementations of prominent e-voting systems to provide vote privacy and verifiability. In RPC mix nets, higher efficiency is traded for a lower(More)
Recently, Xia et al. proposed a variant of Prêtà Voter which enjoys several attractive properties. Their protocol is among the few verifiable and receipt-free paper-based voting protocols resistant against randomization attacks. Trust is distributed among several authorities and the voter interface is relatively simple. Also, approval and ranked elections(More)
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