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This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations. ( April 2009 ) (Learn how and when to remove this template message) "Defense intelligence" redirects here. For other uses, see Defense intelligence (disambiguation) and Military Intelligence (disambiguation). Part of a series on War History Prehistoric Ancient Post-classical Early modern Late modern industrial fourth-gen Battlespace Air Cyber Information Land Cold-region Desert Jungle Mountain Urban Sea Space Weapons Armor Artillery Biological Cavalry Chemical Conventional Cyber Electronic Infantry Nuclear Psychological Unconventional Tactics Aerial Battle Cavalry Charge Counterattack Counter-insurgency Cover Foxhole Guerrilla Morale Siege Swarming Tactical objective Target saturation Trench Operational Blitzkrieg Deep operation Maneuver Operational manoeuvre group Strategy Attr...

Military Enigma machine, model "Enigma I", used during the late 1930s and during the war; displayed at Museo scienza e tecnologia Milano, Italy Military Enigma machine (in wooden box) The Enigma cipher machine Enigma machine Enigma rotors Breaking Enigma Polish Cipher Bureau Doubles Grill Clock Cyclometer Bomba Zygalski sheets Bletchley Park Banburismus Herivel tip Crib Bombe Hut 3 Hut 6 Hut 8 PC Bruno Cadix Ultra v t e The Enigma machines are a series of electro-mechanical rotor cipher machines, mainly developed and used in the early- to mid-20th century to protect commercial, diplomatic and military communication. Enigma was invented by the German engineer Arthur Scherbius at the end of World War I. [1] Early models were used commercially from the early 1920s, and adopted by military and government services of several countries, most notably Nazi Germany before and during World War II. [2] Several different Enigma models were produced, but the German military models, ha...