I had a similar book as a kid and I loved it until the covers fell off. How sad was the day I realized I didn’t have any secrets worth encrypting, and no enemy spies were on their way.
The NSA don’t count?
I’m intrigued. This is the kind of book that my son may just love. However, I did read the sample and was underwhelmed. I was expecting more number games, puzles, encoding/decoding samples, and other things. Maybe they are in the later chapters. Has anyone had a deeper look?
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