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if you really want to add an extra layer of security, add the layer outside your computer. You know, like adding a moat outside the castle. https://s-media-cache-ak0.pinimg.com/564x/96/12/a6/9612a6cd64fe89d6efe9734320d136ff.jpg https://s-media-cache-ak0.pinimg.com/564x/96/12/a6/9612a6cd6...