Fall 2019

Publicly Verifiable Zero Knowledge on Blockchains

Monday, Sep. 23, 2019 2:30 pm3:00 pm PDT

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Alessandra Scafuro (North Carolina State University) 

We show how to obtain a publicly verifiable zero-knowledge argument system based on public-coin honest-verifier zero-knowledge proofs and any blockchain that satisfies a mild assumption. The assumption is that sufficiently many future (honest) blocks include a high min-entropy string. Our publicly-verifiable zero-knowledge proofs are secure against a verifier/prover that can corrupt blockchain players adaptively. The only previously known construction of publicly verifiable zero-knowledge proofs, provided by Goyal and Goyal in TCC 2017  works only for proof-of-stake blockchains, allows only static corruption of the stakeholders and restricts the use of the secret keys of honest stakeholders.