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A few months prior, a recent paper showcased several novel attacks on the Fiat-Shamir transformation. Quanta published a notable article that clarifies the findings.

This paper is rather thrilling from a theoretical viewpoint, yet I don’t foresee it resulting in any tangible real-world cryptanalysis. The existence of peculiar circumstances that lead to Fiat-Shamir vulnerabilities isn’t unprecedented—numerous papers have been authored on the subject since 1986. What this latest finding does is broaden the known issue to somewhat less peculiar (yet still highly artificial) contexts. However, it remains an entirely different ordeal to apply these kinds of attacks to “natural” situations.

What this finding accomplishes, nonetheless, is render it unfeasible to offer general security proofs for Fiat-Shamir. It stands as the most captivating outcome in this research domain, highlighting that we are still quite distant from comprehensively grasping the precise security assurance provided by the Fiat-Shamir transformation.

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