Polybius/Smitty Tap Code Cipher

April 11, 2011
From Vietnam, all the way to modern day American penitentiary comes the tap code. Based partially on a Polybius square, inmates and POWs used this method to communicate to each other where they were not able to talk.

In this code, you'll notice that there is no "K", due to the 25-space block here. So "C" is used in the place of "K."

  1 2 3 4 5

1 A B C D E

2 F G H I J

3 L M N O P

4 Q R S T U

5 V W X Y Z





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