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Experts Increasingly View SolarWinds Breach as Attack on US, Opening Way for Retaliation On 12/18/20 at 7:44 PM EST The unprecedented hack that appears to have first hit software company SolarWinds before spreading to some of the highest levels of the U.S. government is testing the definition of what constitutes cyber espionage and what the Pentagon defines as an actual attack on the nation. If it is determined to be an attack, experts warn it would open the way for retaliation, including in the physical realm. But defining exactly what constitutes an attack in cyberspace, even in the 21st century, remains a murky issue.

United statesJamil jafferNancy nortonRaj shahDepartment of homeland security cybersecurityDod information networkDefense information systems agencyDepartment of defense information networkSenate foreign relations committeeHouse intelligence committeeGeorge mason university national security instituteInfrastructure security agencyNational intelligenceIntelligence communityComputer network attackNetwork attack