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Title:
Estonian Voting Verification Mechanism Revisited Again
Authors: Ivo Kubjas, Tiit Pikma, Jan Willemson
Abstract:Recently, Mus, Kiraz, Cenk and Sertkaya proposed an improvement over the present Estonian Internet voting vote verification. This paper points to the weaknesses and questionable design choices of the new scheme. We show that the scheme does not fix the vote privacy issue it claims to. It also introduces a way for a malicious voting application to manipulate the vote without being detected by the verification mechanism, hence breaking the cast-as-intended property. As a solution, we propose modifying the protocol of Mus et al. slightly and argue for improvement of the security guarantees. However, there is inherent drop in usability in the protocol as proposed by Mus et al., and this issue will also remain in our improved protocol.
ePrint: https://eprint.iacr.org/2017/081
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