CMU-ISRI-04-116
Institute for Software Research International
School of Computer Science, Carnegie Mellon University



CMU-ISRI-04-116

Receipt-Free Homomorphic Elections
and Write-in Voter Verified Ballots

Alessandro Acquisti

April 2004

CMU-ISRI-04-116.ps
CMU-ISRI-04-116.pdf


Keywords: Electronic voting, Receipt-Freeness, uncoercibility, write-in ballots, voter verified (verifiable) ballots, homomorphic encryption, Paillier cryptosystem.


We present a voting protocol that protects voters privacy and achieves universal verifiability, receipt-freeness, and uncoercibility without ad hoc physical assumptions or procedural constraints (such as untappable channels, voting booths, smart cards, third-party randomizers, and so on). We discuss under which conditions the scheme allows voters to cast write-in ballots, and we show how it can be practically implemented through voter-verified (paper) ballots. The scheme allows voters to combine voting credentials with their chosen votes applying the homomorphic properties of certain probabilistic cryptosystems.

25 pages


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