Polybius Square client-side ?
How to use Polybius SquareThe Polybius square arranges the alphabet in a 5×5 grid and replaces each letter with its row number followed by its column number. Since the grid only has 25 cells, I and J usually share the same cell. You can scramble the grid with a keyword to strengthen the cipher. The tool encrypts, decrypts and displays the generated grid. Everything is processed in your browser.
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The Polybius square arranges the alphabet in a 5×5 grid and replaces each letter with its row number followed by its column number. Since the grid only has 25 cells, I and J usually share the same cell. You can scramble the grid with a keyword to strengthen the cipher. The tool encrypts, decrypts and displays the generated grid. Everything is processed in your browser.
Encode each letter as coordinates on a 5×5 grid.
How to use Polybius Square
The Polybius square arranges the alphabet in a 5×5 grid and replaces each letter with its row number followed by its column number. Since the grid only has 25 cells, I and J usually share the same cell. You can scramble the grid with a keyword to strengthen the cipher. The tool encrypts, decrypts and displays the generated grid. Everything is processed in your browser.
Frequently asked questions
Why do I and J share a cell?
To fit the 26 letters into a 25-cell (5×5) grid. On decryption the “I/J” cell is read from context.
What is the keyword for?
It fills the grid starting with the keyword's letters, scrambling the alphabetical order and making analysis harder.