by, 01-08-2012 at 12:42 PM (1631 Views)
Java applets are contained within a “sandbox” by default and due to security reason. A signed Applet is a trusted Applet. This signed Applet can perform any action within sandbox and outsides it boundaries. For example, reading, writing and deleting file on local drives or accessing different system parameters.
Earlier versions of browsers have no support for signed Applet and do not allow operations outside sandbox. To sign an Applet, applet’s code must be digitally singed with digital ID. The unsigned Applet can request for privilege to access resources outside sand box.