We’ve created a world where information technology permeates our economies, social interactions, and intimate selves. The combination of mobile, cloud computing, the Internet Things, persistent computing, and autonomy are resulting in something different. This World-Sized Web promises great benefits, but is also vulnerable to a host of new threats. Threats from users, criminals, corporations, and governments. Threats that can now result in physical damage and even death. This talk looks back at what we’ve learned from past attempts to secure these systems, and forward at what technologies, laws, regulations, economic incentives, and social norms we need to secure them in the future.