Playfair Cipher
Classic 5×5 digraph substitution cipher.
About this tool
Pick a keyword to seed the 5×5 grid (I/J share a square). Encrypts and decrypts uppercase digraphs; identical pairs get an inserted X.
Classic 5×5 digraph substitution cipher.
Pick a keyword to seed the 5×5 grid (I/J share a square). Encrypts and decrypts uppercase digraphs; identical pairs get an inserted X.