Saturday, October 9, 2010

Polybius Square Cipher

In the polybius square cipher each letter is put in a 5x5 grid (doubling up I and J) and then each letter is represented by its coordinates in the grid.

If our message was
“x marks the spot”

The cipher would be
53 32 11 42 25 43 44 23 15 43 35 34 44

Some variation could be added to this cipher by putting the alphabet in a different order on the grid, perhaps backward or diagonally.

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