In ancient times, the wise used codes to conceal secret knowledge from those who were not considered worthy. Now the code crackers have a powerful new ally in the form of AI, and centuries-old documents are yielding their secrets.
Ciphers date back at least to ancient Greece, and were well known to the Romans. According to Suetonius, Julius Cæsar used one for sensitive military communications around 58 BC, shifting each letter three places in the alphabet, so A was replaced with D, B with E and so on. The Cæsar cipher, as it became known, was not
