According to an excerpt of the book "Enigma The Battle for the Code" written by British author Hugh SebagMontfiore, the British had captured a number of German vessels which unearthed codebooks that were put to use in Bletchley Park to solve Enigma However, after the Germans modified the naval enigma machine to include a fourth rotorThe most sensitive intelligence came from ULTRA—the code name applied to all intel coming from Bletchley Park, including the intercepts of German military messages sent with the ENIGMA machine Because of the volume of the traffic and the overriding need for compartmentalization, the British insisted that the OSS set up a separate, extra#2 During the early 1930's Polish mathematicians had been contracted by the military to provide intelligence By 1933, a group of three Polish mathematicians, Marian Rejewski, Henryk Zygalski and Jerzy Rozycki made the breakthrough that would arguably decide the outcome of the war They broke the German Enigma system of codes
Enigma And A Way To Its Decryption