Abstract

The security of distributed systems, particularly in cloud-based environments and microservices architectures, is paramount as organizations increasingly rely on these systems for scalable and efficient operations. This paper explores the implementation of OAuth2 and JWT (JSON Web Tokens) protocols as fundamental components in securing distributed API gateways. OAuth2 offers a robust framework for authorization by decoupling user authentication from application logic, while JWT provides a lightweight and secure method of transmitting authentication information across services. The paper discusses the core components of OAuth2 and JWT, their roles in API security, and the implementation best practices that ensure secure token management, scalability, and fault tolerance. Case studies from cloud-based systems and microservices architectures illustrate real-world applications, highlighting both successes and challenges encountered during deployment. Key findings indicate that while OAuth2 and JWT significantly improve security, challenges such as token expiration management and service-to-service token validation persist. Finally, the paper identifies areas for future research, particularly in the development of enhanced token revocation mechanisms and the adaptation of OAuth2 and JWT for emerging technologies like serverless architectures. The study underscores the importance of these protocols in the evolving landscape of secure API gateway management and their potential to drive secure, scalable digital transformation.