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Jerzy Różycki (pronounced YEH-zhih roo-ZHITS-kee) (1906–9 January 1942) was part of the Polish Biuro Szyfrów (Cipher Bureau) in the early 1930s. He was a classmate of Marian Rejewski and Henryk Zygalski, and actually joined the Biuro before Rejewski who spent some time in graduate school in Germany before joining.
After Rejewski made the conceptual breakthrough against the Enigma cypher rotor machine used by the German Army, Różycki was part of the team that further developed the break into a useful intelligence tool. He was, for instance, involved in the design of the cyclometer and bomba devices which were used to rule out impossible Enigma keys or, alternatively, to help identify possible keys.
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