All news with #cryptanalysis tag

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.

1965 Cryptanalysis Training Workbook Released by NSA

🧾 The NSA has declassified a September 1965 training workbook, Cryptanalytic Diagnosis with the Aid of a Computer, compiling 147 printouts from the diagnostic program Stethoscope. Run on the special-purpose Bogart computer, the listings show statistical outputs—frequency tables, index of coincidence, periodicity tests, and n-gram analyses—used to train analysts to infer language and cipher type without seeing plaintext. The document also notes the related tool Rob Roy and reflects an era when computers automated manual analytic work.