[Resource Topic] 2015/740: Predictable Arguments of Knowledge

Welcome to the resource topic for 2015/740

Title:
Predictable Arguments of Knowledge

Authors: Antonio Faonio, Jesper Buus Nielsen, Daniele Venturi

Abstract:

We initiate a formal investigation on the power of {\em predictability} for argument of knowledge systems for \NP. Specifically, we consider private-coin argument systems where the answer of the prover can be predicted, given the private randomness of the verifier; we call such protocols Predictable Arguments of Knowledge (PAoK). Our study encompasses a full characterization of PAoK, showing that such arguments can be made extremely laconic, with the prover sending a single bit, and assumed to have only one round (i.e.,\ two messages) of communication without loss of generality. We additionally explore PAoK satisfying additional properties (including zero-knowledge and the possibility of re-using the same challenge across multiple executions with the prover), present several constructs of PAoK relying on different cryptographic tools, and discuss applications to cryptography.

ePrint: https://eprint.iacr.org/2015/740

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