Cipher Department of the High Command of the Wehrmacht information
German Signal Intelligence Agency
The Cipher Department of the High Command of the Wehrmacht (German: Amtsgruppe Wehrmachtnachrichtenverbindungen, Abteilung Chiffrierwesen) (also Oberkommando der Wehrmacht Chiffrierabteilung or Chiffrierabteilung of the High Command of the Wehrmacht or Chiffrierabteilung of the OKW or OKW/Chi or Chi) was the Signal Intelligence Agency of the Supreme Command of the Armed Forces of the German Armed Forces before and during World War II. OKW/Chi, within the formal order of battle hierarchy OKW/WFsT/Ag WNV/Chi, dealt with the cryptanalysis and deciphering of enemy and neutral states' message traffic and security control of its own key processes and machinery, such as the rotor cipher ENIGMA machine. It was the successor to the former Chi bureau (German: Chiffrierstelle) of the Reichswehr Ministry.[1]
^Friedrich L. Bauer: Decrypted Secrets. Methods and Maxims of cryptography. 3d revised and expanded edition. 2000, p. 412
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The Oberkommando der Wehrmacht (German: [ˈoːbɐkɔˌmando deːɐ̯ ˈveːɐ̯ˌmaxt] ; abbreviated OKW German: [oːkaːˈveː] ; Armed Forces HighCommand) was the supreme...
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were used by the German HighCommand, and decrypts of Hagelin ciphers and other Italian ciphers and codes, as well as of Japanese ciphers and codes such...
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