Engelsk

In 1915 two Dutch Naval officers had invented a machine to encrypt messages – this was the Enigma machine. In 1924 the German armed forces began using a specially adapted military version of the Enigma to encrypt their communications. During the Second World War Germans continued to use the Enigma machine to encode messages. The Germans knew that unless one knew the exact settings

of the machine, one couldn't decipher the messages, so Enigma was thought to be uncrackable.                  

The Germans had good reason to believe this. Due to, the Enigma machine settings.  The adapted military version of the Enigma machine had three revolving wheels – or so-called rotors.– When a plaintext letter is typed on the keyboard, what happens is, an electric current passes through the machine settings and lights up a ciphertext letter on the lamp board.  The wheels could be taken out of the machine, and change position or be replaced by the other 2 wheels –  but there must be three revolving wheels inserted in the machine.      When a letter was pressed on the keyboard, the rotor on the right would spin around, when done at spinning, it would set the middle rotor forward one position. After another round of spinning, the rotor on the right would set again the middle rotor forward one position. When the middle rotor had completed a full revolution, it would kick the left rotor forward. On the Enigma machine´s front, 10 cables with a plug at each end would be used to plug pairs of letters together. Example If the letter A were plugged to the letter B, typing the letter A, the electric current would follow the path that was normally associated with the letter B, and this goes for the remaining letters. This were called the plugboard. This means every time a letter was pressed on the keyboard, the movable parts of the machine would change position so the next time the same letter was pressed, it would most likely be enciphered as something different. All this, produced a unique stream of enciphered letters, exactly 158 million million million was the approximate number of possible ways the military version of the Enigma machine could be set. Unless one knew the exact settings of the machine, one couldn't decipher the messages.[1]                       During the Second World, Alan Turing and a crew of code breakers – Welchman Bombe – at Bletchley Park, broke the German Enigma system, knowing the exact settings of the Enigma machine. Frome settings of the Enigma machine, Alan Turing, and the crew, transmitted data into a computer, which decoded the messages from the Enigma machine. This I called electronic data processing. By breaking the German Enigma system, and deciphering the German military codes, England was able to intercept German, Japanese, and other Axis nation’s communications.[2] Western Supreme Allied Commander Dwight D. Eisenhower  –  The 34th president of the United States from 1953 until 1961 – considered the breaking of the German enigma system to have been 

Understanding the film

What is Bletchley Park?

Bletchley Park, Buckinghamshire, became the centre for Allied efforts to keep up with war-induced changes in the German Enigma output. Top mathematicians and general problem-solvers – Alan Turing and his crew– were recruited and a bank of early computers, known as 'bombes', was built to work out the Enigma’s vast number of settings.

Who is Alan Turing?

Alan Turing was a British mathematician, logician and cryptanalyst. During the second World War  Alan Turing and his team decrypted the messages from the Germans to break the Enigma.

How long did he live?  

Alan Turing  lived from 23 June 1912 to 7 June 1954 

How did he die?

Some say Alan Turing committed suicide, but examination established that the cause of death was cyanide poisoning.  

Who is Joan Clarke?

She was the only women working on braking the German Enigma. 

Why was the machine called Christopher?

Alan Turing´s childhood friend died of bovine tuberculosis, as a memory of his friend  Christoper,  he called machine Christopher.

Is it a true story? 

Yes, it is based on true events from the second world war. 

http://www.turing.org.uk/publications/dnb.html

http://media.mentoreurope.eu/static/SRP2015/Kryptologi_og_2_verdenskrig.pdf

Translate the following words into Danish

1.   Decryption = Kryptering betyder, at data kodes til et format, der er ulæseligt for alle, der ikke har en dekrypteringsnøgle.
2.   Enigma = Enigma betyder en gåde eller et mysterium
3.   Prodigy = Betegnelse for Vidunder / vidunderbarn
4.   Mediocrity = Betegnelse for Middelmådighed
5.   An odd duck = Betegnelse for en usædvanlig, anderledes eller mærkelig person
6.   A puff = Gammelt udtryk for en der er homoseksuel.
7.   Brigade = Betegnelse for en trop soldater
8.   Crew = Betegnelse for besætning eller mandskab
9.   Manual = Betegnelse for brugsanvisning/ eller arbejde uden brug af maskiner 
10.   Stigma = Betyder uløselig kode.
11.   Saucy = Engelsk udtryk for fræk eller kæk, Eks. man, she saucy.
12.   During = En gerning man kan gøre I en tidsperiode. f.eks. Han gør sit arbejde godt.