public static void switchScreen(JPanel panel)
	{
		if (panel instanceof PanelKeyGen)
		{
			selectKeyGen.setEnabled(false);
			selectSign.setEnabled(true);
			selectVerify.setEnabled(true);
			
			panelKeyGen.setVisible(true);
			panelSign.setVisible(false);
			panelVerify.setVisible(false);
		}
		else if (panel instanceof PanelSign)
		{
			selectKeyGen.setEnabled(true);
			selectSign.setEnabled(false);
			selectVerify.setEnabled(true);
			
			panelKeyGen.setVisible(false);
			panelSign.setVisible(true);
			panelVerify.setVisible(false);
		}
		else if (panel instanceof PanelVerify)
		{
			selectKeyGen.setEnabled(true);
			selectSign.setEnabled(true);
			selectVerify.setEnabled(false);
			
			panelKeyGen.setVisible(false);
			panelSign.setVisible(false);
			panelVerify.setVisible(true);
		}
		frame.repaint();
	}