Explore a comprehensive keynote address on applying security engineering principles to complex composite systems in modern web applications. Delve into the challenges of securing increasingly intricate systems composed of diverse components, frameworks, and hosting models. Learn high-level principles illustrated through a Smart City transit system example. Gain insights from Neal Ziring, Technical Director at NSA's Capabilities Directorate, as he discusses mission-critical aspects, safety considerations, data protection, and maintaining security throughout a system's lifecycle. Understand the importance of planning for failure, addressing various user types, and managing security from development to decommissioning in today's complex technological landscape.