Homeland Security Today: Cybersecurity challenges rank among the top threats facing the United States in the coming year as the country struggles with identifying and attributing security breaches and protecting the supply chain for US information networks, the top US spy told the Senate Intelligence Committee Tuesday.

James Clapper, director of national intelligence (DNI), pointed to difficulties US authorities face in separating complex cyberespionage from comparatively simple cyberattacks and correctly attributing those cybersecurity breaches to the state or non-state actors responsible for them.

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