Henryk Zygalski
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Henryk Zygalski was a Polish mathematician and cryptologist who worked at breaking German Enigma-machine ciphers before and during World War II.
Henryk Zygalski about 1930
Zygalski sheet
Zygalski in later life
Demonstration of Zygalski sheets at Bletchley Park
Jerzy Różycki
Videos
Jerzy Witold Różycki was a Polish mathematician and cryptologist who worked at breaking German Enigma-machine ciphers before and during World War II.
Jerzy Różycki ca. 1928, some 4 years before joining the Cipher Bureau
Jerzy Różycki memorial bench in Wyszków, near Warsaw
2007 monument to cryptologists Rejewski, Różycki, and Zygalski before the Imperial Castle in Poznań