Abstract
We continue the investigation of interactive proofs with bounded communication, as initiated by Goldreich and Håstad (IPL 1998). Let L be a language that has an interactive proof in which the prover sends few (say b) bits to the verifier. We prove that the complement L has a constant-round interactive proof of complexity that depends only exponentially on b. This provides the first evidence that for NP- complete languages, we cannot expect interactive provers to be much more “laconic” than the standard NP proof.
When the proof system is further restricted (e.g., when b = 1, or when we have perfect completeness), we get significantly better upper bounds on the complexity of L.
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Goldreich, O., Vadhan, S., Wigderson, A. (2001). On Interactive Proofs with a Laconic Prover. In: Orejas, F., Spirakis, P.G., van Leeuwen, J. (eds) Automata, Languages and Programming. ICALP 2001. Lecture Notes in Computer Science, vol 2076. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-48224-5_28
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DOI: https://doi.org/10.1007/3-540-48224-5_28
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