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Secret Codes #5

In Secret Codes #4 you solved a Caesar cipher (you did solve it, right?). That cipher shifted each letter of a message to another letter in the alphabet a fixed number of positions away. So it's one form of substitution cipher.

The enciphered message here doesn't change letters into other letters, but scrambles the message in a particular way. It's a transposition cipher. Welcome to rail fence cryptography!

Rail fence ciphers are used to write a message in a zigzag form, then the letters are ordered linearly from left to right. What you need to know is how many "rails" there are -- HORIZONTAL lines -- as the key. Here's an example of how to encipher a message with a key of 4. The arrow shows the direction to write the message.


method to encipher text using rail fence


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