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As the U.S. Secretary of Defense, Leon Panetta delivered strong warnings about the risks of cyberattacks on the country. His conviction that a possible ” cyber Pearl Harbor” may be looming has not tempered since leaving the post last year.In fact, Panetta today said that the risk of a major cyberattack against the nation’s infrastructure is “the most serious threat in the 21st century.”Speaking at the Symantec Government Symposium here Tuesday, Panetta said such an attack could “devastate our critical infrastructure and paralyze our nation.” He compared the potential disruption nationally to what hurricane Sandy accomplished on the East Coast in 2012.”We have to take steps to better defend ourselves against this threat,” Panetta told an audience of government IT managers and security specialists, as well as federal contractors.Panetta was director of the CIA from 2009 to 2011, and then became the U.S. Secretary of Defense. He left the latter post last year and is now chairman of the Panetta Institute for Public Policy, which he co-founded in 1997.