Abstract
The Pocket Enigma is a crypto-toy for children from 8 to 80 designed by Brian Hargrave and on sale for five UK pounds plus P&P. It is effectively a single rotor Hebern machine (ca. 1920s vintage). I review the strengths and weaknesses of the toy here and show on my website how to cryptanalyse it in a manner understandable to children. Recommendation: buy it and try it.
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