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Qu'est-ce (qui) est cyclometer - définition
![Reconstruction of appearance of cyclometer, based on sketches in [[Marian Rejewski]]'s memoirs](https://commons.wikimedia.org/wiki/Special:FilePath/Cyklometr.jpg?width=200 "Reconstruction of appearance of cyclometer, based on sketches in [[Marian Rejewski]]'s memoirs")
![[[Enigma machine]] – an electro-mechanical [[rotor machine]] with scrambler comprising (right to left) entry drum, three rotors, reflector. A modified version was adopted later in 1920s by German military.](https://commons.wikimedia.org/wiki/Special:FilePath/EnigmaMachineLabeled.jpg?width=200 "[[Enigma machine]] – an electro-mechanical [[rotor machine]] with scrambler comprising (right to left) entry drum, three rotors, reflector. A modified version was adopted later in 1920s by German military.")
![[[Marian Rejewski]], ca. 1932](https://commons.wikimedia.org/wiki/Special:FilePath/Marian Rejewski 1932 small.jpg?width=200 "[[Marian Rejewski]], ca. 1932")
Wikipédia
The cyclometer was a cryptologic device designed, "probably in 1934 or 1935," by Marian Rejewski of the Polish Cipher Bureau's German section (BS-4) to facilitate decryption of German Enigma ciphertext. The original machines are believed to have been destroyed shortly before the German invasion of Poland that launched the Second World War, to prevent the Germans learning that their cipher had been broken.
Using drawings made by Rejewski, Hal Evans and Tim Flack at the Department of Engineering, University of Cambridge, in 2019 constructed a working version of the cyclometer.
