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. Leave a space, then proceed to the next letter in the word.Each letter is represented by two numbers: the first is the number found in step 4 and the second is the one found in step 5 (example: N would be 21).Write the number that is at the top of the column that your letter is in (example: for N, the first number is 1).On a separate piece of paper, write the number at the beginning of the row that your letter is in (example: for N, the first number is 2).To encrypt your message, find the first letter of your message on the square (example: N).Write down your message on your piece of paper.Make sure to only put one letter or number in each cell. Write out the letters A-Z and the numbers 0-9 randomly within the square.Print or draw two copies of the Polybius square template for you and a friend.Scroll to the right to view more of the table. Two copies of the Polybius square template.Use technology that’s over 2,000 years old to send a message that even a spy will have trouble reading! In this activity, transform your message into a code which can only be decoded by someone else with the same Polybius square grid.
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