Vulnerabilities in Fiat-Shamir Proof Systems Identified
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🔍 Recent research highlights vulnerabilities in Fiat-Shamir proof systems. The second part of a series on verifiable computation discusses a paper by Khovratovich, Rothblum, and Soukhanov, which reveals that certain proving schemes, seemingly secure in theory, may be compromised in practice. The Fiat-Shamir heuristic, designed to convert interactive proofs into non-interactive ones, relies on hash functions that can introduce security risks when implemented in real-world applications. The article emphasizes that while Fiat-Shamir can be proven secure under ideal conditions, its application with concrete hash functions raises concerns, particularly in recursive proof systems. This situation underscores the need for caution in deploying these cryptographic techniques, as they may not hold up against practical attacks.
