Description
The Vigenère cipher was created in the 16th-century by French cryptographer Blaise de Vigenère. It was revered as "le chiffre indéchiffrable" or "the unbreakable cipher" for many years after its invention.
It works by concealing the original plaintext with multiple different monoalphabetic substitution ciphers, known as polyalphabetics. In other words, it uses multiple cipher alphabets and shifts the by different amounts- based on the encryption key.