-
Engima was invented
Two Dutch Naval officers invented a machine that can change a text into a code that only other engima could crack. Through time it was made into a type writer but it didn't need to have the code changer because it was after WW2. -
Poland
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 -
Grundstellunmg
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 -
Wheels
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. -
Plugboard
On 1st January the number of plugboard connections was increased from six to ten. -
Umkehrwalze
On 2nd November Umkehrwalze B was introduced, replacing Umkehrwalze A and this remained in use until the end of the war in 1945. -
Unlocked
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.
