Jerzy RozyckiSeptember 1932
Joins Rejewski and Zygalski in the Polish Cipher Bureau's German-cipher section.
Poland · Warfare / World War, 2nd. Chronological records rendered directly from the World History Database.
Joins Rejewski and Zygalski in the Polish Cipher Bureau's German-cipher section.
Joins the Polish Cipher Bureau team attacking German Enigma traffic.
Is assigned to the Polish Cipher Bureau's Enigma problem and applies mathematical permutation theory to the machine.
Reconstructs the internal wiring of the German military Enigma using mathematics and intelligence material.
Uses the reconstructed machine and recovered daily settings to read German military Enigma traffic.
Helps AVA begin production of military Enigma replicas for Polish cryptanalysts.
Works through AVA to build Polish replicas of the military Enigma for the Cipher Bureau.
Directs the Polish Cipher Bureau German section as regular exploitation of Enigma develops.
Develops the clock method for identifying the fast rotor used in Enigma messages.
Develops the cyclometer to catalogue Enigma permutation characteristics and accelerate recovery of daily settings.
Designs the Polish bomba kryptologiczna to automate part of the search for Enigma daily settings.
Designs perforated sheets that can identify Enigma settings despite increasingly complex plugboard connections.
Adapts Polish methods after Germany adds two extra rotors, greatly increasing possible Enigma rotor orders.
Attends the January Paris meeting while Poland initially withholds the full extent of its Enigma success.
Represents the Polish Cipher Bureau at the January allied cryptanalytic meeting in Paris.
Explains Polish Enigma methods and equipment to the British and French delegations at Pyry.
Authorises disclosure of Poland's Enigma achievements to British and French cryptanalysts at Pyry.
Explains the mathematical reconstruction of Enigma and Polish key-recovery methods to allied cryptanalysts.
Shares Polish experience of Enigma rotor analysis with the British and French delegations.
Demonstrates the perforated-sheet method to British and French cryptanalysts at the Pyry meeting.
Helps AVA complete dozens of Enigma replicas before the German invasion of Poland.
Supports production of Polish Enigma replicas, one of which is supplied to Britain before the war.
Meets Turing in France and discusses Polish Enigma methods after the Cipher Bureau's evacuation.
This factsheet is generated from stored World History Database records matching the country, broad category, detailed category and exact Event value shown above. Duplicate display records are collapsed; database wording is otherwise preserved. Source provenance varies by record, so formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.