JSON Web Token (JWT) Security: Exploiting and Securing Web Tokens

JSON Web Tokens (JWTs) are the backbone of modern web authentication, yet simple configuration mistakes can expose your entire application to severe security breaches. This course provides a clear, step-by-step path to understanding how JWTs function, how attackers compromise them, and how to build impenetrable token-based authentication systems. You will transition from understanding basic token structures to confidently auditing and securing web APIs against real-world exploits. What you'll learn: - Understand the core anatomy of a JWT, including headers, payloads, and cryptographic signatures. - Analyze critical security flaws such as the infamous 'none' algorithm vulnerability and key confusion attacks. - Practice identifying weak secret keys using simulated brute-force analysis techniques. - Configure secure storage mechanisms, comparing local storage with secure, HttpOnly cookies. - Implement robust token expiration, rotation, and revocation strategies to prevent replay attacks. - Apply modern industry best practices for secure key management and signature validation. We begin by establishing a solid foundation in cryptographic basics and token structures before dissecting common vulnerabilities through detailed written scenarios and code walkthroughs. This course is designed for beginner developers, QA engineers, and aspiring security professionals who want to understand authentication security from the ground up. Start reading today to master JWT security and protect your applications from unauthorized access.