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A few things come to mind: Something based on XOR. I'm imagining an endlessly (and randomly) streaming bridge of tiles that can either be in the left position or the right position (ie the message) and you can only cross the bridge if they all line up. Straight bridge: ---------- You know that the bridge started straight, but has been XOR'd with ...


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Depending on your video game design you maybe can utilise a many-time pad. Many-time pad is many plaintexts encrypted by XORing them with a common string. One-time pad cannot be broken but many-time pad can, especially if the players can make an educated guess about what the plaintext message might contain. You can also try encrypting numbers with RSA but ...


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Wrapping up my comment as an answer: Imagine you’re a Japanese cryptanalyst in the year 1944. There is no such thing yet called “television”, and you’re still decades away from a wordwide network feeding you with all the knowledge you could wish for. In that case there’s only a minimal chance you’ve ever heard or seen a Navajo. So, you’ll be wondering ...



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