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<!DOCTYPE html> <html> <body> <form action="demo_keygen.asp" method="get"> Username: <input type="text" name="usr_name"> Encryption: <keygen id="myKeygen" name="security"> <input type="submit"> </form><br> <button onclick="disableKey()">Disable Keygen field</button> <button onclick="undisableKey()">Undisable Keygen field</button> <script> function disableKey() { document.getElementById("myKeygen").disabled = true; } function undisableKey() { document.getElementById("myKeygen").disabled = false; } </script> </body> </html>