Explore authentication and authorization techniques for cross-platform applications in this 58-minute conference talk. Delve into the complexities of implementing secure authentication systems across web, mobile apps, and APIs. Learn how to build a centralized authentication system supporting both web and app platforms, utilizing Json Web Tokens for passing claims. Discover best practices for integrating authentication with WebAPI2, and explore concepts such as Autofac-powered filters and OWIN. Gain insights into creating developer-friendly and user-friendly authentication experiences while navigating the challenges of cross-platform security implementation.