A simple application thanks to which we can encrypt or decrypt our message using Vigenere'a Cipher.
In first textArea Wprowadź tekst we can input sentence that we can code or decode. It depence on what we will choose (Szyfrowanie meens "Code" and Deszyfrowanie meens "Decode").
Wprowadź klucz - enter key.
Uruchom - start button.
Wiadomość - our final encrypted or decrypted message
Kopiuj zawartość - copy content button
Wyczyść - clear
It doesn't matter if you write something with capital letters or you use spaces in your key
because I used toLowerCase() and trim() methods.
You have to use the same key that you were using to encrypt your message.