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Electronic Colloquium on Computational Complexity

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All reports by Author Alex Lombardi:

TR21-167 | 23rd November 2021
Alex Lombardi, Fermi Ma, Nicholas Spooner

Post-Quantum Zero Knowledge, Revisited (or: How to Do Quantum Rewinding Undetectably)

Revisions: 1

A major difficulty in quantum rewinding is the fact that measurement is destructive: extracting information from a quantum state irreversibly changes it. This is especially problematic in the context of zero-knowledge simulation, where preserving the adversary's state is essential.

In this work, we develop new techniques for ... more >>>

TR21-032 | 5th March 2021
Justin Holmgren, Alex Lombardi, Ron Rothblum

Fiat-Shamir via List-Recoverable Codes (or: Parallel Repetition of GMW is not Zero-Knowledge)

Shortly after the introduction of zero-knowledge proofs, Goldreich, Micali and Wigderson (CRYPTO '86) demonstrated their wide applicability by constructing zero-knowledge proofs for the NP-complete problem of graph 3-coloring. A long-standing open question has been whether parallel repetition of their protocol preserves zero knowledge. In this work, we answer this question ... more >>>

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