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Saving Peace in Europe through Online Voting and MPC Innovations

After the tumultuous 20th century, Europe's quest for lasting peace continues. While past efforts like sports and song festivals such as Eurovision aimed to unite, modern methods like Secure Multi-Party Computation (MPC) promise greater civic engagement and trust. This paper explores the benefits of online voting using MPC, addressing the need for transparency and reliability in collective decision-making. With public audibility and the potential for honest participation, we can strengthen democracy and ensure that even in cases of corruption, privacy and correctness are maintained in electoral processes.

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Saving Peace in Europe through Online Voting and MPC Innovations

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  1. Saving peace in Europe Using MPC Carsten Baum Aarhus University

  2. After the first half of the 20th century, we Europeans had enough… Enough of these wars! Let‘s all be peaceful and happy.

  3. Approach #1 Футбол, fútbol, Fußball, fodbold, ποδόσφαιρο, calcio, …

  4. Well, that did not work…

  5. Approach #2: Let‘s all sing!

  6. What is Eurovision? • Big TV event (this Saturday!!) • How it works: • Every country is allowed to send someone to present a song

  7. What is Eurovision? • Big TV event (this Saturday!!) • How it works: • Every country is allowed to send someone to present a song • Big Europe-wide vote afterwards to determine who won

  8. Vote you say?? • 21st century approach: Online voting!

  9. Vote you say?? • 21st century approach: Online voting! • Using MPC for voting gives advantages in some scenarios (see paper)

  10. Vote you say?? • 21st century approach: Online voting! • Using MPC for voting gives advantages in some scenarios (see paper) • For example, use a fast online protocol (SPDZ) to obtain the answer very quickly

  11. MPC needs Audit Because…do you really trust any of the participating countries???

  12. Publicly Auditable MPC – the model • Clients: Provide input and will obtain output • Workers: Do the actual computation • The Auditor: Checks whether the computation was correct

  13. Publicly Auditable MPC – the model Downside: • If every party is corrupted, privacy is lost

  14. Publicly Auditable MPC – the model Downside: • If every party is corrupted, privacy is lost BUT: • The Auditor (anyone!) can establish correctness (by looking at the π-transcript) even if every Worker is corrupted

  15. Publicly Auditable MPC – the model Downside: • If every party is corrupted, privacy is lost BUT: • The Auditor (anyone!) can establish correctness (by looking at the π-transcript) even if every Worker is corrupted • If at least one Worker is honest, then we obtain both privacy and correctness

  16. Publicly Auditable MPC – the model • We model this by assuming the existence of an uncorruptible party • This party does not participate during the π-execution

  17. Publicly Auditable MPC – the model • We model this by assuming the existence of an uncorruptible party • This party does not participate during the π-execution • In fact, it must not even exist until π was executed

  18. Publicly Auditable MPC – the model • We model this by assuming the existence of an uncorruptible party • This party does not participate during the π-execution • In fact, it must not even exist until π was executed • This is a generalization of „public verifiability“ for online voting, but here for general MPC

  19. Publicly Auditable MPC as a SPDZ extension • Extension of the SPDZ online phase – but (almost) no heavy crypto required • Extend the SPDZ preprocessing as well (must also be auditable, and indeed is) • (optional) Audit phase if you doubt that the result is correct

  20. eprint 2014/075 More details: „Publicly Auditable Secure Multi-Party Computation“ (joint work with Ivan Damgård and Claudio Orlandi)

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