@franklinheath Profile picture

Franklin Heath Ltd

@franklinheath

Developers and publishers of the most popular Enigma machine simulator on Android. @heathcr and @LouiseJHeath. Now also @[email protected].

Joined December 2010
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03 Dec 1944: German intelligence start to use Enigma KD, with more rotor notches and rewirable reflector (broken by #BPark in Jan 45).


29 Nov 1941: New German navy bigram tables defeat Turing's "Banburismus", much more Bombe time now needed to break Enigma messages.


26 Nov 1931: British intelligence officer Cdr. Wilfred Dunderdale regretfully turns down French Capt. Bertrand's offer of cooperation on breaking Enigma.


24 Nov 1942: Captured German Navy short weather signal codebook arrives at #BPark, making break of 4-rotor U-boat Enigma ("Shark") possible.


23 Nov 1931: French Capt. Bertrand gives copies of Asché Enigma manuals and offer of cooperation to Cdr. William Dunderdale of British SIS.


21 Nov 1940: Bletchley Park Japanese Section office in Elmers School damaged by bombs; Hut 4 shaken by a near miss. #BPark


18 Nov 1939: #BPark's Edward Travis proposes that Gordon Welchman should run new "Production Section" to regularly break Enigma messages.


16 Nov 1944: "Duenna", electromechanical machine built at US NCML in Dayton Ohio to break pluggable-reflector Enigma keys, enters service.


12 Nov 2013: Death of Mavis Batey (née Lever), #BPark cryptanalyst, made crucial break into Italian Enigma before battle of Cape Matapan.


09 Nov 1942: Polish codebreakers evacuate Château des Fouzes secret base "PC Cadix", anticipating German occupation of Vichy France.


08 Nov 1931: German spy Hans-Thilo Schmidt, code named "Asché", passes Enigma operating manuals to French military intelligence.


07 Nov 1942: Alan #Turing departs #BPark for US trip to Dayton,OH (Navy 4-rotor Bombe project) and New York (Bell Labs, Claude Shannon).


06 Nov 1942: Customised Bombe "Funf" installed in #BPark Hut 11A to assist ISK section in decrypting German intelligence Enigma messages.


Franklin Heath Ltd Reposted

Bletchley Park's Red Enigma messages date from the first four days in November 1944, showing part of the process of deciphering messages. This message was intercepted at Chicksands Y Station on 3 November 1944 at 15:37 and was sent to Bletchley Park's Hut 6 at 16:05.

Tweet Image 1
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02 Nov 1937: German military replace Enigma reflector "A" with reflector "B".


01 Nov 1936: German military start changing the Enigma rotor order every day (previously only once per month).


01 Nov 1919: Establishment of UK's Government Code & Cypher School (GC&CS), headed by Alistair Denniston. #BPark


30 Oct 1942: British destroyer HMS Petard captures code books from German submarine U-559, helping break the 4-rotor Enigma Triton key.


28 Oct 1941: Dilly Knox tells #BPark's Commander Denniston that he has worked out the Abwehr (German intelligence) Enigma machine wiring.


27 Oct 1875: Birth of Theodorus Arnoldus van Hengel, Dutch naval officer, believed to have co-invented the rotor cipher machine in around 1915.


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