Bifid Cipher
The Bifid Cipher is closely related to the Polybius Cipher. To use this cipher you first need to find the coordinates of each letter in your message using the Y axis first and then the X axis (Column then Row). For example on this Grid "Best Codes" would become "(1,2)(1,5)(4,3)(4,4) (1,3)(3,4)(4,5)(4,3)"
Now you need to stack the coordinates on top of each other like this...
"1 1 4 4 1 3 4 4"
2 5 3 4 3 4 5 3
Now you put them horizontally and separate them into pairs like this. "11 44 13 44 25 34 34 53"
Each one of these pairs is a new set of coordinates on your grid using (Y,X). Now our message is this "atctkoox"
To decode a message first you need to find the coordinates of each letter. So "atctkoox" becomes "11 44 13 44 25 34 34 53."
Now put the second half the message underneath the first half like this...
"1 1 4 4 1 3 4 4"
2 5 3 4 3 4 5 3
Now each column of numbers is a coordinate. Once you have finished finding all of the coordinates you are done.
Now you need to stack the coordinates on top of each other like this...
"1 1 4 4 1 3 4 4"
2 5 3 4 3 4 5 3
Now you put them horizontally and separate them into pairs like this. "11 44 13 44 25 34 34 53"
Each one of these pairs is a new set of coordinates on your grid using (Y,X). Now our message is this "atctkoox"
To decode a message first you need to find the coordinates of each letter. So "atctkoox" becomes "11 44 13 44 25 34 34 53."
Now put the second half the message underneath the first half like this...
"1 1 4 4 1 3 4 4"
2 5 3 4 3 4 5 3
Now each column of numbers is a coordinate. Once you have finished finding all of the coordinates you are done.
