It's a good read if you like that sort of thing.
What's even more extreme about the Polish codebreakers, a story you would read in Battle of Wits, is that they were evacuated from Poland to France after the invasion of Poland, and then stayed in occupied France working in secret for the Allies as part of the occupation government. They posed to the occupation government as the occupation governments signals intelligence system but secretly supplied GC&CS with information they intercepted from the continent (which the Allies had a lot of trouble doing only from the UK).
They did that for years, when they tried to evacuate themselves to Spain, a few of them were captured, interrogated, and did not give up the goods about either the invasion or the secret of Enigma. If you want wartime crypto heroes you would have a hard time doing better than Jerzy Różycki, Henryk Zygalski and Marian Rejewski.
http://www.amazon.com/dp/0743217349 fully expanded is:
e12e's comment was helpful: it supported the original post and included additional information of use to others. And as it happens, Singh's The Code Book was not included in the original list. You can find it here:
munin would have performed a superior service (remember: writing is for the benefit of the reader) if he'd at least included descriptive URLs, if not the titles of the works in question.
And your attitude could use considerable improvement.
> was helped by the Poles who had stolen a machine before the outbreak of war,
which is false! the poles actually built an ENIGMA after analyzing encrypted traffic, see this book: http://www.amazon.com/dp/0743217349
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