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New Cryptanalysis Challenges Fiat–Shamir Transformation

🔒 A recent paper demonstrates theoretical attacks on the Fiat–Shamir transformation, extending known insecurities into less contrived scenarios while stopping short of immediate practical exploitation. Bruce Schneier notes the result is exciting from a research perspective but does not currently translate into real-world cryptanalysis. The work highlights limits in our ability to produce broad security proofs for the transform. It serves as a reminder that theoretical advances can reshape confidence in cryptographic proof techniques even when deployed systems remain unaffected.