Playfair Cipher

Calculates a substitution cipher based on the Playfair matrix method. This tool processes plain text by converting it into pairs of letters, or digraphs. It utilizes a keyword to generate a virtual five-by-five grid, which dictates the specific letter pairings and shifting rules for encryption. The system encrypts the message by locating these paired letters within the generated matrix and applying geometric shifts—moving right, left, or diagonally across the grid—to determine the corresponding ciphertext characters. Security enthusiasts, cryptography students, and hobbyists use this tool to understand classical ciphers and test basic encryption concepts. It provides a straightforward way to learn how historical methods of secure communication function without requiring manual calculations.