![]() You can even further encrypt your message, in case your Polybius square is intercepted. Turing and another code breaker eventually invented the Bombe, a device used by code breakers to read coded messages from the enemy. The German armed forces used a machine called the Enigma to send coded messages. Observe itĪlan Turing was a mathematician who was a huge contributor towards allied victory during the Second World War. Creating a code or cipher is called encryption. So, you are using a cipher if you come up with code names for people and places that only you and your friend know about. 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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