 function () {
            if (actionSelect.value === 'des_encrypt') {
                keyField.style.display = 'block';
            } else {
                keyField.style.display = 'none';
            }
        });

        form.addEventListener('submit', function (event) {
            event.preventDefault();

            const action = document.getElementById('action').value;
            const data = document.getElementById('data').value;
            const key = document.getElementById('key').value;
    