Jerzy Różycki
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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
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