[Resource Topic] 2025/1993: A Simplified Round-by-round Soundness Proof of FRI

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Title:
A Simplified Round-by-round Soundness Proof of FRI

Authors: Albert Garreta, Nicolas Mohnblatt, Benedikt Wagner

Abstract:

The FRI protocol (ICALP '18) is one of the most influential and widely deployed building blocks at the core of modern SNARK systems. While its concrete security is well understood, existing security proofs are intricate and technically complex.

In this work, we present a significantly simpler security analysis of FRI, in particular its round-by-round soundness.
Our approach is more accessible to a broader audience, lowering the barrier to understanding this fundamental protocol.
Furthermore, the simplicity of our analysis may pave the way for future formal verification efforts of modern SNARK constructions.

ePrint: https://eprint.iacr.org/2025/1993

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