Marian Rejewski, Jerzy Rozycki, Henryk Zygalski and other cryptoanalysts from BS4, broke into Kriegsmarine code in November 1932. Fully decrypted Enigma texts were read by BS4 since mid January 1933. During Roehm's Putsch in June 1934 Enigma messages were read within minutes from their interception. During two weeks long cryptographic exercises organized at BS4 in January 1938 up to 75 percent of secret German communication was decrypted within hours from interception.
Marian Rejewski was a Polish mathematician and cryptologist who in 1932 solved the plugboard-equipped Enigma machine, the main cipher device used by Germany. The success of Rejewski and his colleagues Jerzy Różycki and Henryk Zygalski jump-started British reading of Enigma in World War II; the intelligence so gained, code-named "Ultra", contributed, perhaps decisively, to the defeat of Nazi Germany.
The great Jewish educator Janusz Korczak (physician, writer, and pedagogue) became head of the Warsaw Jewish Orphanage. In the ghetto, he did everything within his power to improve the situation of the children in his orphanage. Although offered the chance, he rejected the opportunity of going into hiding outside the ghetto and instead chose to stand by his orphans. On Aug 5, 1942, Korczak and the 200 children in his orphanage were deported to the Treblinka death camp where they all…
This is a picture of Alan Turing. He was a British maths prodigy. He was one of the head people in cracking Enigma. This is a primary source as it is a photo of Alan Turing before he went to work on cracking Enigma which turned into making "Christopher" or its also known as the Bombe machine.. With Alan making the Bombe machine it shortened the war by a few years and it is estimated that he save millions of live, including Canadian lives.