Luigi Sacco
Luigi Sacco was an Italian general and cryptanalyst.
When Italy entered into World War I, he was a captain serving with radio-telegraphy troops. As specialist in direction finding he led the effort to locate and intercept Austro-Hungarian radiograms on the frontline, but due to a lack cryptanalysts they weren't being decrypted, so in 1916 he had to learn cryptanalysis himself. After the war he wrote books on cryptography.