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Zygalski sheets
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The method of Zygalski sheets was a cryptologic technique used by the Polish Cipher Bureau before and during World War II, and during the war also by British cryptologists at Bletchley Park, to decryp
A Zygalski sheet
A Zygalski sheet
Demonstration of two perforated sheets at Bletchley Park Museum
Demonstration of two perforated sheets at Bletchley Park Museum
Cryptanalysis of the Enigma
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Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications of the Axis powers that had been enciphered usin
Zygalski sheets
…and right rotors and was duplicated horizontally and vertically: a–z, a–y. The sheets were punched with holes in the positions that would allow a "female" to occur. Polish mathematician–cryptologist Marian Rejewski writes about how the perforated-sheets device was operated…
The Enigma machine was used commercially from the early 1920s and was adopted by the militaries and governments of various countries—most famously, Na
The Enigma machine was used commercially from the early 1920s and was adopted by the militaries and governments of various countries—most famously, Nazi Germany.
The plugboard (Steckerbrett) was positioned at the front of the machine, below the keys. In the above photograph, two pairs of letters have been swapp
The plugboard (Steckerbrett) was positioned at the front of the machine, below the keys. In the above photograph, two pairs of letters have been swapped (A↔J and S↔O). During World War II, ten leads were used, leaving only six letters 'unsteckered'.
Marian Rejewski c. 1932, when he first broke Enigma
Marian Rejewski c. 1932, when he first broke Enigma