Enigma Machine Applet: Here’s a Java implementation of the Enigma encoding machine, used in World War II. While it’s fun to play with, unless you know how Enigma worked, it’s not going to make much snese.
Simon Singh’s “The Code Book” provides the clearest explanation of Enigma that I’ve ever read. Via MetaFilter.
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Here's something embarrassing to admit: I picked up this book from the "New Nonfiction" shelf of my public library. I read it cover-to-cover in two days, just enthralled with both the subject matter and Simon Singh's incredible ability to explain it. Then, finished and satisfied, I leaned back and read the book…