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Limits RegistryPolish mathematician Marian Rejewski of the Cipher Bureau in Warsaw reconstructed the wiring of the German military Enigma's rotors in December 1932, using permutation-group theory together with key settings supplied by French intelligence. Poland shared its methods with Britain and France in July 1939, laying the groundwork for Bletchley Park's wartime Ultra intelligence.
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Polish mathematician Marian Rejewski of the Cipher Bureau in Warsaw reconstructed the wiring of the German military Enigma's rotors in December 1932, using permutation-group theory together with key settings supplied by French intelligence. Poland shared its methods with Britain and France in July 1939, laying the groundwork for Bletchley Park's wartime Ultra intelligence.
The year cryptanalysts first recovered the internal rotor wiring of the military Enigma, enabling decryption of its traffic.
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Limits Registry. LR-ENIGMA-FIRST-CRYPTANALYSIS. First break of the German Enigma cipher machine. 2026.