Cyberspace-the globally interconnected information infrastructure that includes the Internet, telecommunications networks, computer systems, and industrial control systems-is rich in opportunities to improve the lives of people around the world. Assuring continued growth and innovation in cyberspace requires that the public has a well-founded sense of trust in the environment. Increasingly frequent malware attacks and financial and intellectual-property thefts must be addressed in order to sustain public trust in cyberspace but address real threats to national security.