The Vigenère Cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution
First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indéchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially Vigenère ciphers. In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenère ciphers.
In the 19th century the scheme was misattributed to Blaise de Vigenère (1523–1596), and so acquired its present name
This application will demonstrate how the Vigenère Cipher encrypts text input. In the key field, enter a word that will serve as the cipher's key. Then enter your message and watch it translate into ciphertext. You can copy/paste or type the ciphertext into the decode input box to see it decoded again. The input can't include spaces or punctuation