Active Cyber Defense Active Cyber Defense Northrop Grumman. Share WebsitecyberRelated Posts:UK National Cyber Security Centre BlogDARPA NewsAdvanced Persistent ThreatUK National Cyber Security CentreCyber Crime and Computer HackingPurdue University Cybersecurity NewsRisky BusinessUS National Cyber Awareness System Alerts We are an ethical website cyber security team and we perform security assessments to protect our clients.