09 Feb 1926: German military's first use of Enigma machine - Navy adopt a modified Enigma model C, calling it "Funkschlüssel C".
Android Enigma Simulator
@enigmasim
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The most popular Enigma machine simulator on Android. We post announcements about the app and "on this day" Enigma anniversaries. Personal account: @heathcr.
08 Feb 1941: Denniston, Travis & Tiltman greet #BPark's first American visitors: Sinkov & Rosen (US Army), Weeks and Currier (US Navy)
07 Feb 1941: #BPark Hut 6 break into "Rocket", the Enigma key used by the German railways organisation in the Balkans.
03 Feb 1957: Death of Air Vice-Marshall Oswyn G.W.G. Lywood, designer in 1934-5 of the British TypeX cipher machine, based on Enigma.
01 Feb 1945: German Luftwaffe introduce encoding for call signs and procedure for changing frequencies, hampering Enigma key breaking.
01 Feb 1942: Commander (later Sir) Edward Travis replaces Commander Alastair Denniston as operational head of GC&CS. #BPark
01 Feb 1942: German Atlantic U-boats start using 4-rotor Enigma machines; #BPark Hut 8 now unable to break into "Shark" messages.
01 Feb 1936: German military start changing the Enigma rotor order each month (previously only once per quarter).
25 Jan 1939: Death of Theodorus Arnoldus van Hengel, Dutch naval officer, believed to have co-invented the rotor cipher machine in around 1915.