Polybius Cipher
The Polybius Cipher is a 5x5 grid filled with 25 letters (26 if you want to fit 2 letters in one square) in any order created by a Greek author named Polybius. You can use this cipher by using taps for coordinates or you could write out a message which would be harder to crack.
To encrypt your message look at the coordinates of the letter you are trying to encrypt. On this particular grid if you wanted to write "Code" you would find the coordinates for "C" which is (3,1) 3 being on the X axis and 1 on the Y axis.
"C" will now become "AC" because the Y axis is "1" which is equal to "A" and the X axis is "3" which is equal to "C".
Repeat this process with all of the letters until you are finished. When you are finished you should have twice as many letters in your encrypted message than in your original message. The word "Code" would become "ACCEADAE."
To decode a message you need a copy of the grid the sender used.
Separate every two letters from each other like this "AC CE AD AE."
Now you need to put translate the letters into numbers. Now you would have this "1,3 3,5 1,4 1,5." These numbers are coordinates on this grid, remember that with these coordinates it's Y,X instead of the usual X,Y. Once you have found all of the coordinates you have decoded your message!
To encrypt your message look at the coordinates of the letter you are trying to encrypt. On this particular grid if you wanted to write "Code" you would find the coordinates for "C" which is (3,1) 3 being on the X axis and 1 on the Y axis.
"C" will now become "AC" because the Y axis is "1" which is equal to "A" and the X axis is "3" which is equal to "C".
Repeat this process with all of the letters until you are finished. When you are finished you should have twice as many letters in your encrypted message than in your original message. The word "Code" would become "ACCEADAE."
To decode a message you need a copy of the grid the sender used.
Separate every two letters from each other like this "AC CE AD AE."
Now you need to put translate the letters into numbers. Now you would have this "1,3 3,5 1,4 1,5." These numbers are coordinates on this grid, remember that with these coordinates it's Y,X instead of the usual X,Y. Once you have found all of the coordinates you have decoded your message!
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