Why was BletchleyPark able to break the Enigma codes?

        None of the other achievements would of meant anything if it wasn’t for the correct calculations of the team at Bletchley Park. One of the big improvements if for the first Bombe machine designed by Alan Turing is installed at Bletchley Park. However it didn’t include the improvements suggested by Gordon Welchman and Alan Turing

Himself, so it can only work out Enigma settings on the day in question.

In March 1943 the code breakers manage to break into shark once again using the short signal codebook, which had been captured of U-559 on 30th of October 1942, to help them identify the cribs.

        The German high command made some very important mistakes during World War 2; these mistakes advanced the work being done at Bletchley Park a huge way. Between 3-21st of May 1940 the Germans analyzed the damage that was done by the disappearance of the Polares and decided that their codes were not likely to have been compromised, as there were only settings until 1st of June 1940 so they can reestablish cipher security after that.

On 28 September the British submarine ‘Clyde’ attempts to ambush three U boats; when all three U-Boats escape, Dönitz (a German admiral) notes in his war diary that the most likely explanation is that the cipher has been compromised.

Between 18-24 October the German Navy’s Communications Service analyze the cipher system and declare that the code hasn’t been compromised even due to the ambush in September.

On 19th September 1943 Hans Thilo Smidtz commits suicide. The Germans never realized that the enigma documents shown to the French were enough to compromise the enigma ciphers during the war.

On 12 March the Brake, a German supply vessel, is sunk during ‘Operation Covered’. This leads the Germans to conclude that the Naval Enigma Cipher may have been compromised.

        The code breaking teams from all countries will not have continued without the support and resources from their various governments for example the 24 June 1940 French government flew the polish cryptographers to Oran in Algeria. But in three months they would be flown back in spite of the risks.

In 12 September 1940 Ian Fleming (author of the ‘James Bond 007’ series of Books) suggested that they capture the Naval Enigma codebook by Crashing a captured German aircraft into the English Channel, and then capturing the rescue boat, but this was later dropped as it deemed impractical.

On 6 June 1941 Winston Churchill visited Bletchley Park to give the workers a speech to help boost the morale at the park, he said ‘the Geese that lay the Golden Eggs and never cackle”.

22 November 1941 after a tip of by Enigma Intelligence, the Royal Navy sinks the German supply ship ‘Atlantis’ as it meets up with some U-Boats. Another Ambush 9 day later will cause the Germans to ask if the Enigma had been compromised.

The Governments put the French and Polish cryptographers under top security as they want to keep the fact they had cracked into the Enigma, as this would make the Germans change the code. On 8-9 November 1942 the Polish cryptographers were evacuated from the code breaking centre after the invasion of North Africa as a German invasion of southern France is certain.

On 12th of February 1943 Gustave Bertrand received a message form Antoni Palluth, who was one of the engineers that worked on the replica enigma machine, stating that he had been arrested by the Germans. Also on the 17th of February Rudolphe Lemoine, the French spymaster who knows about Hans Thilo Schmidt and the Enigma manuals, is arrested by the Germans in the south of France.

On the 3rd of June 1944 Paul Paille , the French Counter Intelligence chief, Reads Bertrands report on how he escaped from the Germans and is asked by Sir Stewart Mezies, the head of British Secret Intelligence service, to interrogate Bertrand to discover if he told the Germans that the Allies had broken the enigma code because then he could also have told them about the Allied invasion, But it was concluded that Bertrand hadn’t told the Germans anything, Bertrand is detained for a few day until the Allied invasion just in case.