Polybius squares for encryption, illustration. Polybius tablets and squares were originally used in Ancient Greece to transmit messages via torches. It is a system used for encryption and telegraphy. It works by replacing each letter of the alphabet with a two digit number. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Schroeder, Monica |
Bildgröße: | 4500 px × 4500 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |