White House officials and the chairman of the Joint Chiefs of Staff disagree about whether the United States has a coherent national strategy to address cyber threats. The issue surfaced when Gen. Martin Dempsey voiced concerns at the Atlantic Council about the nation's lack of preparedness for a cyber attack, cited strategic shortcomings and assigned blame to Congress. "We have sectors within our nation that are more ready than others, but we don't have a coherent cyber strategy as a...