![]() You can also rearrange letters or use substitutes to disguise the message, which is called a cipher. You can keep messages secret by coming up with a code where you replace words or groups of words with groups of letters or numbers, like the Polybius square does. Swap your piece of paper with the encrypted message on it with your friend’s paper and decrypt their message using the Polybius square. Leave two spaces at the end of each word.
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