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Ludwig Stummel (5 August 1898 in Kevelaer – 30 November 1983 in Kronberg im Taunus) was a German career signals officer with the rank of Konteradmiral, who had a glass eye and a limp and who was in effect, the Chief of Staff of the Naval Warfare department, Naval Communications (4/SKL) of the Kriegsmarine. Stummel was most notable for being the person responsible for the cryptographical security of the Enigma cipher machine and Key M infrastructure security, during World War II. Stummel was replaced at the Kriegsmarine Naval War Command on the 16–17 August 1944 by Fritz Krauss, after becoming ill. Stummel was a fervent Catholic. His faith gave him a moral compass during the latter years of the war. Initially a supporter of Nazis, he became doubtful as the war progressed. He was released from the Kriegsmarine in February 1945.