The TLS protocol is designed to provide three essential services to all applications running above it: encryption, authentication, and data integrity. Technically, you are not required to use all three in every situation. You may decide to accept a certificate without validating its authenticity, but you should be well aware of the security risks and implications of doing so. In practice, a secure web application will leverage all three services.
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The runtime hosting infrastructure for ASP.NET 5 is currently called the K Runtime Environment (KRE), which is a generic placeholder name until we finalize the official name. The KRE provides an environment that has everything a .NET app needs to run: a host process, CLR hosting logic, managed entry point discovery and so forth. The KRE was built for running cross-platform .NET Web applications, but it can run other types of .NET applications, too, such as console apps. The KRE is based on the same .NET CLR and base class libraries .NET developers have come to know and love, while enabling cross-platform support for running .NET applications on Windows, OS X and Linux.
The world has come a long way from the first context-sensitive C code editor in the early 1980s. Tooling and languages developed initially for desktop apps have been extended to encompass server, cloud and other environments. The Microsoft .NET Framework and Visual Studio provide state-of-the-art tools that greatly increase programmer efficiency. The .NET Framework tools and languages provide rich libraries and collaboration tools, and protect programmers from the most common mistakes.