This design removes access to the operating system from would-be hackers, creating a virtually impenetrable firewall environment. In December 2000, CyberGuard's appliances became the world's first to earn the Common Criteria Evaluation Assurance Level 4 certification, a rigorous security standard that is recognized by 15 countries around the world. About CyberGuard Corporation CyberGuard Corporation, the technology leader in network security, provides enterprise and electronic commerce security solutions to Fortune 1000 companies and governments worldwide. CyberGuard's high-security, high-performance integrated firewall and VPN appliance products and services protect the integrity of data and applications from unauthorized access. CyberGuard's appliances are the world's first to receive the rigorous information technology security certification Common Criteria EAL4, plus the first to enroll in Common Criteria evaluation assurance maintenance.