About: Cipher Department of the High Command of the Luftwaffe

Cipher Department of the High Command of the Luftwaffe was the signals intelligence and cryptanalytic agency of the German Air Ministry before and during World War II. In 1945, the unit was known as the Luftnachrichten Abteilung 350, abbreviated as OKL/Ln Abt 350 and formerly called the (German: Oberkommando der Luftwaffe Luftnachrichtenabteilung 350). It was the successor in November 1944 of the unit formerly named as the Chi-Stelle Ob.d.L. (German: Chiffrierstelle, Oberbefehlshaber der Luftwaffe, lit. 'code centre, High Commander of the Air Force'), which was often abbreviated to Chi-Stelle/ObdL.