In fifth grade, some of my friends and I created a cipher in order to pass notes in class. It wasn’t a terribly sophisticated cipher, but it was effective enough to foil the class busybody, who constantly scanned the classroom for miscreants. Many years later, I ripped through the Sherlock Holmes story The Adventure of the Dancing Men, which reminded me of how much fun codes and ciphers can be. It’s a topic that has a long and interesting history, and instantly captures most students’ attention.
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