What is a vigenre cipher?

A Vigenère cipher is a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution. It employs a keyWord, where each letter of the keyWord corresponds to a shift in the alphabet for the letters of the plaintext. The encryption process involves aligning the keyWord with the plaintext and shifting each letter of the plaintext by the position of the corresponding letter in the keyWord. This makes the Vigenère cipher more secure than a basic Caesar cipher, as it uses multiple shifts, complicating frequency analysis.