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Implementing STV securely in Pret a Voter

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1 Author(s)
Heather, J. ; Univ. of Surrey, Guildford

Work on electronic voting systems to date has largely focused around first-past-the-post voting. However, the governments of many countries, and many non-governmental organisations, use a single transferable vote system, in which the voter needs to indicate not just a single preferred candidate but a preference ranking of (some or all of) the candidates on offer. This paper investigates the possibility of modifying Pret a Voter to cope with a single transferable vote system. With its newer form involving re-encryption mixes by P.Y.A. Ryan and S.A. Schneider (2006), this seems at first sight to be impossible; with the older version based on RSA onions by D. Chaum et al (2005), the obvious approach works, but security is less than ideal; using multiple re-encryption mix onions for each vote, combined with a lazy decryption semantics, however, proves to be an elegant and efficient solution to the problem.

Published in:

Computer Security Foundations Symposium, 2007. CSF '07. 20th IEEE

Date of Conference:

6-8 July 2007