Proton Mail on Nostr: Caesar used to communicate privately by encrypting his correspondence with what came ...

Caesar used to communicate privately by encrypting his correspondence with what came to be called the #caesarcipher.

This simple and widely known encryption technique is a substitution cipher in which each letter in plaintext is replaced by another letter following a fix position further up or down the alphabet.
This modest form of #encryption required no mathematics, and it could be done by finger-counting.

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