Publicly Verifiable Proofs from Blockchains

Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review

  • Alessandra Scafuro, North Carolina State University
  • ,
  • Luisa Siniscalchi
  • Ivan Visconti, University of Salerno

A proof system is publicly verifiable, if anyone, by looking at the transcript of the proof, can be convinced that the corresponding theorem is true. Public verifiability is important in many applications since it allows to compute a proof only once while convincing an unlimited number of verifiers. Popular interactive proof systems (e.g., -protocols) protect the witness through various properties (e.g., witness indistinguishability (WI) and zero knowledge (ZK)) but typically they are not publicly verifiable since such proofs are convincing only for those verifiers who contributed to the transcripts of the proofs. The only known proof systems that are publicly verifiable rely on a non-interactive (NI) prover, through trust assumptions (e.g., NIZK in the CRS model), heuristic assumptions (e.g., NIZK in the random oracle model), specific number-theoretic assumptions on bilinear groups or relying on obfuscation assumptions (obtaining NIWI with no setups). In this work we construct publicly verifiable witness-indistinguishable proof systems from any -protocol, based only on the existence of a very generic blockchain. The novelty of our approach is in enforcing a non-interactive verification (thus guaranteeing public verifiability) while allowing the prover to be interactive and talk to the blockchain (this allows us to circumvent the need of strong assumptions and setups). This opens interesting directions for the design of cryptographic protocols leveraging on blockchain technology.

Original languageEnglish
Title of host publicationPublic-Key Cryptography – PKC 2019
EditorsDongdai Lin, Kazue Sako
Number of pages28
Place of publicationCham
PublisherSpringer
Publication year2019
Pages374-401
ISBN (print)9783030172527
DOIs
Publication statusPublished - 2019
Externally publishedYes
Event22nd IACR International Conference on Practice and Theory of Public-Key Cryptography, PKC 2019 - Beijing, China
Duration: 14 Apr 201917 Apr 2019

Conference

Conference22nd IACR International Conference on Practice and Theory of Public-Key Cryptography, PKC 2019
LandChina
ByBeijing
Periode14/04/201917/04/2019
SeriesLecture Notes in Computer Science
Volume11442 LNCS
ISSN0302-9743

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