Designing Secure Systems: Authentication and Authorization Fundamentals

Securing modern distributed applications requires a deep understanding of how identity is verified and permissions are managed at scale. Without a solid foundation in authentication and authorization architecture, systems remain vulnerable to critical security exploits. This text-only course guides you through the fundamental principles of system design security. You will transition from understanding basic security concepts to confidently designing architecture patterns that protect user data and restrict access across distributed services. What you'll learn: Understand the core differences between authentication and authorization in distributed architectures; Explore modern token-based authentication patterns, including JWT structure and security best practices; Analyze industry-standard delegation protocols like OAuth and OpenID Connect; Design access control strategies using Role-Based Access Control and Attribute-Based Access Control; Apply zero-trust security concepts and secure API gateway patterns to centralize access control. You will start with key security terminology and foundational definitions before progressing to practical architectural scenarios. Through clear written explanations and architectural walkthroughs, you will learn how to evaluate and select the right security patterns for your applications. This course is designed for beginner software engineers, aspiring system architects, and developers who want to build a strong foundation in system security. No prior security experience is required. Begin reading today to master the core principles of secure system design.