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How to use decipher text message7/12/2023 ![]() The waiter leaves and you unfold the paper. He indicates that the note was sent by a person seated across the room-you take a look and quickly recognize him to be a trusted colleague. You’re sitting alone in a restaurant when the waiter approaches your table and slides a small piece of folded paper in front of you. Here’s the somewhat ridiculous but hopefully amusing scenario: Imagine you’re a secret agent working for your government’s top-secret espionage agency. ![]() Curious to know how it works? You’re in luck because today we’re taking our first steps into the world of secret-agent math. Would you believe it’s possible to send someone a secret message secured with absolutely unbreakable encryption using only a bit of simple arithmetic? Well, it is-the solution is surprisingly simple and was used by British, German, and American spy agencies throughout World War II.
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