Modern security models that presume no implicit confidence include zero-trust architecture (ZTA), which requires constant verification of all requests, users, and devices, regardless of their location. In this post, I describe how to use tried-and-true security concepts and tools to design and implement zero-trust principles in C# services, specifically within ASP.NET Core. What Is Zero-Trust?…

A safe two-factor authentication (2FA) technique called TOTP (Time-based One-Time Password) creates short-lived, one-time codes for user verification. These codes are synchronized with the current time and refresh at predetermined intervals, often every 30 seconds. Compared to static passwords, TOTP improves security by dynamically updating the valid code, which drastically lowers the possibility of unwanted…