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puzzle: add illustration

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Lotte Steenbrink 2021-05-05 19:53:15 +02:00
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embedded-workshop-book/src/radio-puzzle.md
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# Radio Puzzle
![illustration showing that you send plaintext and the dongle responds with ciphertext](../img/puzzle_illustration.jpg)
Your task in this section is to decrypt the [substitution cipher] encrypted *ASCII* string stored in the Dongle. The string has been encrypted using *simple substitution*.