Abstract :OAuth 2.0 has become a widely adopted authorization framework, providing a secure and standardized method for granting third-party applications access to user resources without exposing credentials. This abstract explores the implementation patterns of OAuth 2.0 within cloud architecture, emphasizing its significance in enhancing security, scalability, and flexibility in cloud-based systems. By leveraging OAuth 2.0, cloud services can effectively manage access control and authorization across distributed environments, ensuring seamless and secure interactions between users, applications, and services [1]. The paper delves into key OAuth 2.0 patterns such as Authorization Code Flow, Implicit Flow, Client Credentials Flow, and Resource Owner Password Credentials Flow, discussing their respective use cases, benefits, and potential security concerns. The abstract highlights the importance of OAuth 2.0 in facilitating microservices communication, enabling multi-tenancy, and supporting API gateways, which are crucial for modern cloud architectures. It underscores the role of OAuth 2.0 in achieving compliance with data protection regulations by providing granular access control and robust audit mechanisms. The abstract also positions OAuth 2.0 as a vital component in cloud architecture, offering a comprehensive approach to authorization that balances security, usability, and performance. By adopting OAuth 2.0 patterns, cloud providers and enterprises can enhance their ability to deliver secure, scalable, and responsive services, thereby meeting the evolving demands of the digital landscape.

Keyword : Authentication, Authorization, Implicit Grants, Security, Open Authentication, JWT2.0, Web Applications, Cyber Security