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A remote voting system based on Prêt à Voter coded by David Lundin Johannes Clos

A remote voting system based on Prêt à Voter coded by David Lundin Johannes Clos. Design goals. End-to-end verifiable (if...) ‏ Offload authentication to host organization Easy to set up, maintain and use Use publicly available mix servers (when...) ‏. Limitations. Unsupervised voting

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A remote voting system based on Prêt à Voter coded by David Lundin Johannes Clos

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  1. A remote voting systembased on Prêt à Votercoded byDavid LundinJohannes Clos

  2. Design goals • End-to-end verifiable (if...)‏ • Offload authentication to host organization • Easy to set up, maintain and use • Use publicly available mix servers (when...)‏

  3. Limitations • Unsupervised voting • No coercion resistance • No guarantee of response from server • Someone has to authenticate users • We use host organization (could use our server)‏ • Some parts not quite complete • Threshold decryption • SSL certificates (time/money)‏

  4. Operational overview

  5. Election setup phase • Create election on EE • Don't declare voters! • Retrieve shared secret • Retrieve signed applet • Integrate host auth

  6. Client authentication phase • Voter logs on normally • Host serves applet • PHP script gets authentication information

  7. Voting phase • Vote using applet • Applet encrypts vote • ElGamal encryption • Ciphertexts à la [Hea07] • Packaged as XML • Committed to • Audit or vote • Vote sent back to host • Host signs XML • Sent back to ee.com • Signed receipt given

  8. Auditing

  9. Voting and auditing • Voting applet • constructs XML • reveals XML and hash • offers vote or audit • Voter then can either • audit, and uncover details of encryptions • vote, and get signed hash • Audit gives confidence in applet's fairness

  10. Decryption/tallying after polls close • Use mix nets • PRC to audit mixes • Anyone can audit • Public mix servers • Votes decrypted • Threshold decryption • CP proofs • Anyone can check • Lazily decrypt (STV)‏ • Anyone can tally

  11. Auditing the mix nets • A mix net • re-encrypts votes • randomly shuffles • Twice, with PRC • Links chosen by hash of output • Can be re-run

  12. Conclusion • Pretty much plug-and-play • Any organization hosting a web site can use • End-to-end verifiable • ...on various seemingly unavoidable assumptions

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