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Vitalik Buterin announced his endorsement of Interfold, a privacy-preserving protocol optimized for on-chain voting and secret-ballot auctions that implements concepts he has advocated for nearly a decade. '
The protocol uses a threshold encryption key, zero-knowledge proofs to verify voter eligibility, and fully homomorphic encryption (FHE) to perform arbitrary computations on encrypted votes before threshold-decryption.
According to Buterin, Interfold achieves multiple security guarantees: voter anonymity can be made unconditional if eligibility is proven with zero-knowledge SNARKs; censorship resistance is guaranteed by Ethereum since votes post directly on-chain with proofs that all posted votes are included in the result; and correctness of the output can be ensured via ZK proofs over FHE.
