I was fully aware of the Polish contribution - in fact it's mentioned on the Bletchley Park tour, which includes memorial to the Polish cryptographers.
A more correct version of my previous comment would have been "the mechanical device that was used to decrypt Enigma".
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Enigma has not been cracked by British but by Polish cryptographers. It's very well documented.
This Wikipedia page covers the history of Enigma cryptanalysis well: http://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma
Bletchley Park fully recognizes the significance of the initial work done in Poland (see, for example, their annual Polish festival: http://www.bletchleypark.co.uk/calendar/event_detail.rhtm?re... and publications like this: http://www.bletchleypark.co.uk/content/hist/history/polish.r... and the Polish memorial on site).
I'm just letting know previous poster that he's not correct. That's all.
I was fully aware of the Polish contribution - in fact it's mentioned on the Bletchley Park tour, which includes memorial to the Polish cryptographers.
A more correct version of my previous comment would have been "the mechanical device that was used to decrypt Enigma".