Timeline of the enigma machine

how the enigma machine changed the war!!!!!!!!!!!!!!!!!!!!!!

Timeline

1931
Steckered Enigma machine adopted by the German army. Wheels used: Umkehrwalze A (reflector) and wheels I, II, III. Messages used a fixed daily Grundstellung to double encipher each message key. The message header would contain two trigrams which is the double enciphered message key enciphered using the daily Grundstellung (message key was keyed in twice)

1932
Late 1932 Polish Cryptanalyst Marian Rejewski recovers the entire machine wiring by mathematical analysis using a group of intercepts and machine settings for two months, September and October 1932, supplied by the French.

1937
On 2nd November Umkehrwalze B was introduced, replacing Umkehrwalze A and this remained in use until the end of the war in 1945.

1938
On September 15th the fixed daily Grundstellung was dropped. Each message must now have a different Grundstellung selected by the operator. The message header would contain three trigrams, the Grundstellung followed by the double enciphered message key enciphered using the message Grundstellung

1938
On 15th December wheels IV and V were added. Three wheels could now be selected from a set of five - giving 60 possible arrangements. A different wheel arrangement could now be used for every day of the month. The two additional wheel wirings were quickly recovered by Rejewski.

1939
On 1st January the number of plugboard connections was increased from six to ten.

1940
The First Welchman-Turing Bombe enters service in March.

1940
On 1st May the double enciphered message key was dropped. The Message key was only enciphered once from now on. The message header would contain two trigrams, the message Grundstellung followed by the enciphered message key.