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Lost WWII Cipher Manuals Discovered in Prague Archive

3/7/2026

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Story summary
  • Researchers in Prague uncovered lost manuals for the Schlüsselgerät 41 (SG-41), a Nazi cipher machine, nearly 80 years after World War II.
  • The documents, found in the Military History Institute and the Security Services Archive, include operating instructions, encryption guidelines, and key tables from March 1945.
  • The SG-41 was designed by Fritz Menzer.