Luigi Sacco (1 August 1883 in Alba – 5 December 1970 in Rome) was an Italian general and cryptanalyst.[1]
At the entrance of Italy into WWI, 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.[2]
Manual of Cryptology ("Manuale di Crittografia") (1936)