- $220 (US, estimated)
During WWII, the Germans coded their radio messages using the Enigma ciphering machine; when the Allies finally figured out how to build one, cracking the German code, they changed the war. There are Engima machines on eBay from time to time, but this kit looks like it would be a fun build (and a lot cheaper). Its an updated version of the classic Enigma that uses modern electronic components.
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