Polybius Square Guide

Polybius Square is simple grid style cipher. You can currently use static alphabet which is repeating, starting from left to right and then top to bottom.

Here is basics for how to use Polybius square

• Create grid of your liking for example 5 x 10 grid.
• Click build square so size you wanted will be drawn on screen.
• Click letters on the grid to get output string.
• Copy to clipboard via "To Clipboard" button.

Now you can send this to someone or test it yourself via going away from this view and coming back again.

• Paste your cipher string into input (same as output)
• Click "Decrypt" button and app builds grid based on string and then gets back original letters.

How this works?

• Starting letters "5x10#" tells that grid is 5 x 10 and # is starting sign for letter position parts.
• "3-7;" is first command where ";" is ending prefix.
• This process repeats till every one of them is executed.

---

Here I created input from 5 x 10 grid

Here I navigated back to same view

I pasted copied cipher string (first image) and clicked decrypt

---