Reference : Caveat Coercitor: coercion-evidence in electronic voting
Scientific congresses, symposiums and conference proceedings : Paper published in a book
Engineering, computing & technology : Computer science
Caveat Coercitor: coercion-evidence in electronic voting
Ryan, Peter mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Computer Science and Communications Research Unit (CSC) >]
Grewal, Gurchetan S. []
Ryan, Mark D. []
Bursuc, Sergiu []
34th IEEE Symposium on Security and Privacy (SP)
MAY 19-22
[en] Coercion resistance ; coercion evidence ; electronic voting ; verifiable elections ; security protocols ; security models ; usability
[en] The balance between coercion-resistance, election verifiability and usability remains unresolved in remote electronic voting despite significant research over the last few years. We propose a change of perspective, replacing the requirement of coercion-resistance with a new requirement of coercion- evidence: there should be public evidence of the amount of coercion that has taken place during a particular execution of the voting system. We provide a formal definition of coercion-evidence that has two parts. Firstly, there should be a coercion-evidence test that can be performed against the bulletin board to accurately determine the degree of coercion that has taken place in any given run. Secondly, we require coercer independence, that is the ability of the voter to follow the protocol without being detected by the coercer. To show how coercion-evidence can be achieved, we propose a new remote voting scheme, Caveat Coercitor, and we prove that it satisfies coercion-evidence. Moreover, Caveat Coercitor makes weaker trust assumptions than other remote voting systems, such as JCJ/Civitas and Helios, and has better usability properties.

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