Better switch back to your old, yellowed PS/2 mouse. A trio of researchers have shown that USB devices represent in and of themselves a potential security risk. Your data will never be safe again! Well, this is true and it isn’t. Would you notice if, say, your keyboard was switched out for another one? Potential data thieves would have a hard time replicating the filth patterns on my keyboard, that’s for sure. But say they did, successfully. John Clark, Sylvian Leblanc and Scott Knight of the Royal Military College in Kingston, Ontario, Canada have discovered that there’s a rather simple exploit…