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.
If the end of your message doesn't encrypt, please try a longer keyword.