Polybius Square Cipher
Substitute each letter with its row + column digits on a 5×5 grid.
About this tool
Decimal coordinates from a Polybius square encode each letter (I/J merged). An optional keyword seeds the grid for a key-dependent encoding.
Substitute each letter with its row + column digits on a 5×5 grid.
Decimal coordinates from a Polybius square encode each letter (I/J merged). An optional keyword seeds the grid for a key-dependent encoding.