One of the most famous uses of cryptography is Caesar’s cipher, developed by Julius Caesar around 40 BC. People refer to it as Caesar’s cipher.
Caesar’s cipher is an encryption method for English letters, which can render an English text unreadable to outsiders, as it appears as a random series of characters. In reality, Julius Caesar simply shifted each letter in the alphabet, replacing each letter with a few letters further down or a few letters back in the alphabet. For example, shifting the alphabet five positions to the right would mean that the letter “A” represents “F”, and “B” represents “G”. Consequently, when transmitting messages, concerns of interception can be reduced, as only those who know the encryption rules can understand how to decipher the message.