NDLI: Delegating computation: interactive proofs for muggles

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Delegating computation: interactive proofs for muggles

Content Provider	ACM Digital Library
Author	Goldwasser, Shafi Kalai, Yael Tauman Rothblum, Guy N.
Abstract	In this work we study interactive proofs for tractable languages. The (honest) prover should be efficient and run in polynomial time, or in other words a "muggle". The verifier should be super-efficient and run in nearly-linear time. These proof systems can be used for delegating computation: a server can run a computation for a client and interactively prove the correctness of the result. The client can verify the result's correctness in nearly-linear time (instead of running the entire computation itself). Previously, related questions were considered in the Holographic Proof setting by Babai, Fortnow, Levin and Szegedy, in the argument setting under computational assumptions by Kilian, and in the random oracle model by Micali. Our focus, however, is on the original interactive proof model where no assumptions are made on the computational power or adaptiveness of dishonest provers. Our main technical theorem gives a public coin interactive proof for any language computable by a log-space uniform boolean circuit with depth d and input length n. The verifier runs in time (n+d) • polylog(n) and space O(log(n)), the communication complexity is d • polylog(n), and the prover runs in time poly(n). In particular, for languages computable by log-space uniform NC (circuits of polylog(n) depth), the prover is efficient, the verifier runs in time n • polylog(n) and space O(log(n)), and the communication complexity is polylog(n). Using this theorem we make progress on several questions: We show how to construct short (polylog size) computationally sound non-interactive certificates of correctness for any log-space uniform NC computation, in the public-key model. The certificates can be verified in quasi-linear time and are for a designated verifier: each certificate is tailored to the verifier's public key. This result uses a recent transformation of Kalai and Raz from public-coin interactive proofs to one-round arguments. The soundness of the certificates is based on the existence of a PIR scheme with polylog communication. Interactive proofs with public-coin, log-space, poly-time verifiers for all of P. This settles an open question regarding the expressive power of proof systems with such verifiers. Zero-knowledge interactive proofs with communication complexity that is quasi-linear in the witness, length for any NP language verifiable in NC, based on the existence of one-way functions. Probabilistically checkable arguments (a model due to Kalai and Raz) of size polynomial in the witness length (rather than the instance length) for any NP language verifiable in NC, under computational assumptions.
Starting Page	113
Ending Page	122
Page Count	10
File Format	PDF
ISBN	9781605580470
DOI	10.1145/1374376.1374396
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-05-17
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Muggles Interactive proofs Delegation
Content Type	Text
Resource Type	Article

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