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Like a lot of pople I find Enigma and codebreaking fascinating, so I could not resist X-POSTing this from a computer programer's blog.

A lot of people now think that Alan Turing cracked the Enigma. A lot of people like to correct those people and say that it was the Poles who truly cracked the Enigma. So we really need to correct everyone and set things straight, because it was far more nuanced than that, with far more people involved, and different versions of Enigma were cracked even earlier. If you read enough about code breaking you end up with a fuzzy timeline in your head pieced together from all the various sources. Here’s what I’ve osmosed:...
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Also, a few years ago I built my own virtual Enigma machine in an Excel Spreadsheet. I'm still quite please with the end result, here's a video of it: