Foundations of User Authentication for Web Applications

Securing user data and controlling access is a fundamental requirement for almost every modern web application. Understanding how authentication works from the ground up ensures you can build systems that protect user identities and resist common security threats. This text-only course guides you through the core concepts of user authentication, starting with foundational definitions and moving step-by-step toward modern security practices. You will gain a clear conceptual understanding of how credentials are saved, verified, and managed across the web. What you'll learn: - Learn the fundamental differences between authentication and authorization. - Understand secure password storage using modern hashing algorithms like bcrypt and argon2. - Explore session-based authentication versus token-based authentication using JWTs. - Configure basic multi-factor authentication flows to add an extra layer of security. - Practice identifying common authentication vulnerabilities and how to prevent them. - Master the basics of federated identity and modern flows like OAuth2. You will start by exploring basic terminology and the mechanics of password storage, then progress to sessions, JSON Web Tokens, and modern third-party login systems. The material is structured to build your confidence through clear written explanations and conceptual code examples. This course is designed for beginner web developers, software engineering students, and curious creators who want to understand how login systems work behind the scenes. No prior security experience is required. Start reading today to build a strong foundation in web security and user management.