The Polybius cipher is a substitution cipher using a grid (the Polybius square). Invented in ancient times by the Greek general Polybius, it transforms each letter into a pair of coordinates according to its …

According to Polybius' Histories, the device was invented by Cleoxenus and Democleitus, and further developed by Polybius himself. The device partitioned the alphabet into five tablets with five letters …

The Polybius square or Polybius checkerboard is a method for fractionating plaintext characters so that they can be represented by a smaller set of symbols. Each letter is represented by its coordinates in …

Free online Polybius Square cipher tool. Encrypt and decrypt text using this classic coordinate-based cipher with customizable grid options and interactive visualization.

Named after the ancient Greek historian Polybius (200-118 BCE), this ingenious cipher transforms letters into coordinate pairs using a grid system, making it a foundational technique in classical …

Aug 12, 2024 · A Polybius Square is a table that allows someone to convert letters into numbers. To make the encryption little harder, this table can be randomized and shared with the recipient.

Free Polybius cipher converter with 5×5 grid. Encode text to numbers and decode cipher messages instantly. Learn ancient Greek cryptography with step-by-step examples.

Dec 11, 2025 · You can use a Polybius square to encode a message that can then be deciphered only by someone who knows the arrangement of letters in the square. It's not secure enough to send …

Discover the fun of transforming your messages into encrypted puzzles using the classic Polybius Square method. Just type in your text, encrypt it, and then challenge your friends to decode it.

The Polybius Square is essentially identical to the simple substitution cipher, except that each plaintext character is enciphered as 2 ciphertext characters. It can ususally be detected if there are only 5 or 6 …