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When first discovered in 2010, the Stuxnet computer worm posed a baffling puzzle. Beyond its unusually high level of sophistication loomed a more troubling mystery: its purpose. Ralph Langner and team helped crack the code that revealed this digital warhead's final target -- and its covert origins. In a fascinating look inside cyber-forensics, he explains how. Ralph Langner heads Langner, an independent cyber-security firm that specializes in control systems -- electronic devices that monitor and regulate other devices, such as manufacturing equipment >>>