![]() Despite being called the Vigenère cipher in honor of Blaise de Vigenère, it was actually developed by Giovan Battista Bellaso. The Vigenère cipher was invented in the mid-16th century and has ever since been popular in the cryptography and code-breaking community. To use Atbash, you simply reverse the alphabet, so A becomes Z, B becomes Y and so on. It is believed to be the first cipher ever used. The Atbash Cipher is a really simple substitution cipher that is sometimes called mirror code. Monoalphabetic Substitution Cipher Tool. ![]() The more difficult variant, without word boundaries, is called a Patristocrat. ![]() If it contains word boundaries (spaces and punctuation), it is called an Aristocrat. Each letter is substituted by another letter in the alphabet. The monoalphabetic substitution cipher is one of the most popular ciphers among puzzle makers.
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