Jerzy Różycki

? Jerzy Rozycki / i ( born July 24, 1909 in Oltschana in Kiev, † January 9, 1942 in the Mediterranean near the Balearic Islands ) was a Polish mathematician and cryptologist.

Rozycki was born in what was then Tsarist Russia near the present-day Ukrainian capital Kiev, the fourth and youngest child of Zygmunt Rozycki and his wife Wanda, née Benita. His father was a trained pharmacist and had studied at the University of Saint Petersburg. The young Jerzy attended a Polish school in Kiev and moved in 1918 to the post-World War newly rediscovered standene Poland. In 1926, he completed his schooling from the Polish town situated at the bow Wyszków.

From 1927 to 1932 he studied mathematics at the University of Poznan, where he completed on February 19, 1932 his studies. Later he also studied geography, a course which he also graduated in Poznan on 13 December 1937.

In 1929, while still a student, took Rozycki, who spoke fluent German, as one of about twenty students of mathematics at a secret course on cryptology in part, of the Polish Dechiffrierstelle, the Biuro Szyfrów ( German: " cipher bureau" ) was organized, which then based in the Saxon Palace (Polish Pałac Saski) in Warsaw. From September 1932 he worked together with his former fellow students from Poznan, Marian Rejewski and Henryk Zygalski, at the decipherment of radio messages, the encrypted German military with their ENIGMA machine.

After his colleague Rejewski had reconstructed the military version of the German cipher machine in December 1932, Rozycki worked together with his friends and Rejewski Zygalski sophisticated methods to break the Enigma keys that were changed by the German daily. Jerzy Rozycki invented while the "clock method", by which it was possible sometimes to figure out which of the three rolls of ENIGMA was operated at the right position as a "fast" roll.

Rozycki drowned in the Mediterranean on 9 January 1942, when the French passenger ship Lamoricière sank with him aboard in a storm near the Balearic Islands. He left behind his wife Maria Barbara Mayka, whom he had married in 1938, and the common Janusz son Jan Rozycki, who had come on 10 May 1939 on the world. January Janusz Rozycki later completed his studies at the Academy of Fine Arts in Warsaw and won in 1964, together with the Polish Fencing team a silver medal at the Summer Olympics in Tokyo.