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Wombat Voting

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  1. Wombat Voting Alon Rosen IDC Herzliya July 20, 2012

  2. Project Participants Amnon Ta Shma (TAU) Douglas Wikstrom (KTH) Ben Riva (TAU) NikoFarhi (TAU) Morgan Llewellyn (IMT Lucca) Jonathan Ben-Nun IDC Students: TomerGabbai, Doron Sharon, ShiranKleiderman, IdoBergerfroind, AsafGamliel, Daniel Rapaport, OmriBaumer, AsafInger, EitanGrundland

  3. Electronic voting in Israel

  4. The Israeli System

  5. 4 Years ago… Well, introducing computers will help us for sure * Meir Shitrit, Israel’s former Minister of Interior

  6. Not what we hoped for... The design process was problematic: • No public scrutiny • No open design • And, the resulting system was not satisfactory: • No paper trail • No transparency • …

  7. Why is this so challenging?

  8. Secrecy vs. Verifiability Voting system convince Carl the coercer Alice

  9. Desired Properties Aliceverifiesher vote. Everyoneverifiestallying. Alicecannot be coerced by Carl.

  10. 1892 - Australian Ballot

  11. Paper vs. Electronic • Paper elections • Local attacks • Lacks transparency • Electronic elections today • Global attacks • Undetectable • Unrecoverable • No transparency • Ideally • No local/global attacks • Full transparency

  12. What is Transparency? Anyone can verify that: • their vote is cast as intended • the votes were counted as cast

  13. The Wombat Voting System

  14. Main Features • Simple design. • Voter privacy. • End-to-end verifiability. • No need to trust the designers!

  15. Objectives • Easy to use. • Versatile. • Paper backup.

  16. Public Ballots Alice: Sweet Bridget: Sweet Carol: Salty Tally Sweet….2 Salty…...1 Alice

  17. Encrypted Public Ballots Alice: Sweet Bridget: Sweet Carol: Salty Everyone verifies the tally Tally Sweet….2 Salty…...1 Alice verifies her vote Alice

  18. System components • Dual ballot • Voting machine • Polling station committee • Public bulletin board • Mixnet Vote

  19. The Ballot א א

  20. Voting Booth • Vote selection • Ballot printing • Hardware • Touch screen • Printer

  21. Polling Station • Voter identification • Vote casting • Hardware • A desktop computer • 2D barcode scanner

  22. Website (Hebrew)

  23. Website (English)

  24. Elections set-up

  25. Voting

  26. Simple and Familiar

  27. Tallying • Encrypted votes are mixed by the mixnet. • Mixed decrypted votes and proofs of correctness are published in the Bulletin board. • Paper votes may be tallied according to policy.

  28. Auditing • Auditing the machine (“cast as intended”): • Audit by users using Android application. • Random audit by designated auditors. • Auditing the bulletin board. • Android application. • Validation of mixnet proofs of correctness: • Built-in verifier. • 2 Independent verifiers.

  29. Verification (manual)

  30. Verification (phone)

  31. Behind the scenes Auditing the booth: cast-or-audit

  32. Behind the scenes Auditing the booth: cast-or-audit Auditing the tally: Verifiable Mixnet

  33. Elections with Wombat • IDC Student council elections: May 17-19 2011 • Meretz party chairman: February 7, 2012 • IDC Student council elections: May 21-23 2012

  34. IDC 2011 Elections • Non-profit college with ~6000 students. • 28 different races. • Students eligible to vote on multiple races. • 2097 students voted.

  35. Some Statistics • Voting took 1-2 minutes: • 30 Seconds for voter identification • 30 Seconds for scanning the ballot • 579 voters verified ballot at bulletin board • Students encouraged to verify with a coveted prize • (2 x faculty parking spots).

  36. Questionnaire • 403 students answered an on-line survey. • 78 answered a random exit survey. • Students encouraged to answer by offering prize. • High levels of voter satisfaction and confidence. • The processes of folding ballots and validating votes should be improved.

  37. Questionnaire • “How satisfied are you with your voting experience?” • “The Voting Process Was Clear and Simple”

  38. Meretz Party Leader • Party leader elected by party council consisting of 950 representatives. • Highly diverse set of voters: • Age (many over 50), gender, education, ethnicity… • 830 (88%) voted. • 23 voters verifiedtheir vote.

  39. IDC 2012 Elections • 2120 Students voted. • Only 16 students checked their votes.

  40. Difficulties & Lessons • Technical difficulties: • Electricity power loss. • Printer hanging. • Difficulties in folding the ballot. • Mitigated by volunteers instructing voters before entering the voting booth.

  41. Pictures

  42. Pictures

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