Bletchley Park, the "home of the codebreakers" -- where Alan Turing and co cracked the Nazi Enigma machine -- sells "Pocket Enigma Machines" made from a clever cardboard disc inserted into a CD jewel case. It comes with a very good booklet explaining the basics of ciphering and deciphering with Enigma, and with a bunch of fun Enigma-related activities. Proceeds go to the nonprofit that runs the excellent Bletchley Park museum.
The instructions supplied explain how Pocket Enigma works and take the user step-by-step through the process of coding and decoding. Worked examples and carefully annotated figures illustrate how the Key and Message Setting are used, and there is a trouble-shooting table to help with common errors.
For young readers there is also a simplified way of using it called Junior Pocket Enigma making it suitable for all ages who can read and write their own messages.
Nelson E. Ross’s “small booklet” sets out the principles of sending telegrams “in the most economical manner possible,” so you can take full advantage of a communications medium that “annihilates distance and commands immediate attention.”
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