Polish mathematician who developed the mathematics behind the `bombes' used to break the Nazi enigma encryption scheme. He, Jerzy Rózycki, and Henryk Zygalski developed the bombe, as well as another, non-mechanical, method for cracking Enigma. The (mainly British) group at Bletchley Park (including Alan Turing) went on to develop a method based on the bombes for breaking Enigma relatively quickly.

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