Codes and Ciphers: How did people in the past encrypt their messages

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We can find many different secret ways of writing in history. Scytale cipher was a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchment wound around it on which is written a message. The ancient Greeks, and the Partans are said to have used it to communicate during military campaigns. The Caesar cipher is said to be one of the oldest and simplest forms of encrypting a message. This method uses the switching of a letter by another one further in the alphabet. Another interesting one is smoke signals. Native americans smoke signals allowed quick visual communication over long distances. Translations of the smoke signals were agreed in advance so that messages remain a secret. Morse code is a famous method of translating letters into dots and dashes. It allowed for early telegraph systems to communicate through the use of electric sounds. Public Key is another popular method which was used in the 1970s to protect one’s privacy. The presumption is to have one or more trusted parties digitally sign documents certifying that a given cryptographic key belongs to a particular user or device.

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