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Nullification, a coercion-resistance add-on for e-voting protocols


Nullification, a coercion-resistance add-on for e-voting protocols

Nejadgholi, Mahdi (2022) Nullification, a coercion-resistance add-on for e-voting protocols. Masters thesis, Concordia University.

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Coercion is one of the remaining issues on internet voting. Many developing
countries are prone to this problem due to lower income rate. In this study, a novel coercion-resistant protocol has been proposed that can be integrated with previously proposed e-voting systems. We call it nullification. We present it as a part of the VoteXX e-voting protocol that has been designed and implemented through this study.

Nullification gives the voter a strategic advantage over the coercer. The voter can share her keys with a trusted proxy, called a nullifier, for later flipping that vote. Integrity and ballot secrecy are provided simultaneously through the use of zero-knowledge proofs, specifically Σ-protocols. We show how our approach is different from (and potentially composable with) re-voting or panic password techniques that have been previously proposed in the academic literature.
Through designing this protocol, we solve several issues, design new Σ-protocols and protocols for the secure evaluation of basic logic functions like exclusive-or (xor) under encryption: True XOR and Online XOR have been proposed that improves the previously proposed Mix and Match protocol for secure multi-party computation of an arbitrary function under constrained input domain.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Concordia Institute for Information Systems Engineering
Item Type:Thesis (Masters)
Authors:Nejadgholi, Mahdi
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Information and Systems Engineering
Date:1 August 2022
Thesis Supervisor(s):Clark, Jeremy
ID Code:991031
Deposited By: Mahdi Nejadgholi
Deposited On:27 Oct 2022 14:28
Last Modified:27 Oct 2022 14:28
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