Cofer Black, former director of CIA’s Counterterrorism Center, spoke at BlackHat security conference. Black: Government officials have shown a hesitancy to act until they see a validation of the threats. Black was one of those who warned of a likely attack on U.S. soil one month before 2011 attacks. Cyberattacks that target physical infrastructure could merit a kinetic or physical response, he said. Stuxnet attacks against Iran’s nuclear infrastructure are indicative of how cyberattacks are evolving.”]