A Simplified Round-by-round Soundness Proof of FRI

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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,