To encipher your message using the Vigenère
Cipher, select your keyword and type it into the box below.
Then click on the button labelled 'Select Keyword'. The
screen will now show only the cipher alphabets corresponding
to each letter of your keyword in order, rather than showing
the entire Vigenère Square. Now type your message into the
box labelled 'Plaintext' and click the 'Encipher Plaintext'
button to encrypt your message.