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Snatching the login credentials of a locked computer just got easier and faster, thanks to a technique that requires only $50 worth of hardware and takes less than 30 seconds to carry out. Rob Fuller, a principal security engineer at R5 Industries, said the hack works reliably on Windows devices and has also succeeded on OS X, although he’s working with others to determine if it’s just his setup that’s vulnerable. The hack works by plugging a flash-sized minicomputer into an unattended computer that’s logged…