alt Hacker NewsAlvin's Secret Code by Clifford B. Hicks. That's the one that got me started. I think I read it in 3rd grade (age 8).
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myself248 • yesterday at 10:16 PM
Came here to mention this. It's not too applicable to modern/useful cryptography, but introduces a bunch of related hidden-information concepts like product date codes, which I think I actually use far more often.
Thanks for the recommendation, always great to hear of books begin the journey.