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Codes and Ciphers :: Route Cipher

A Route Cipher is very similar to a Rail Fence cipher with one exception. You still write the message vertically in columns, but instead of reading off the secret message horizontally, you read it off using a predetermined pattern. For example, lets use a spiral pattern for this one:

T S A C T S G
H I S R M S E
I S E E E A J

The last J is just a random letter to fill in the space. If we are using a clockwise spiral to read off the message, then it becomes:

TSACTSGEJAEEESIHISRMSE

A more complex pattern could be, "every other letter going backwards to the front and then every other letter going forwards to the end again", which would give you a secret message of:

JEEISRIGTATSCSHSMESEA

The complex pattern makes this algorithm difficult to decipher unless you know the key.




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