Exam CAS-004 topic 1 question 400 discussion

For the CASP+ exam, the most suitable approach given the requirements of rapid authentication, flexible authorization, ease of deployment, low cost, and high functionality for a web-based application would indeed be **D. OAuth**. OAuth is well-suited for delegated authorization and authentication in web-based applications. It enables users to grant access to their resources without disclosing their credentials directly. OAuth offers rapid authentication, flexible authorization through scopes, ease of deployment due to its widespread adoption and support, and it often comes with low implementation costs. While the other options may provide authentication and authorization capabilities, they might not fulfill all the specified criteria as effectively as OAuth does in this scenario.

o Rapid authentication: OAuth allows users to authenticate quickly by leveraging existing credentials from social media platforms or other trusted services, eliminating the need to create separate accounts or passwords for the new application. o Flexible authorization: OAuth provides granular control over which resources a third-party application can access, allowing for fine-grained authorization based on user roles and permissions. o Ease of deployment: OAuth is relatively simple to implement for developers, requiring minimal setup and integration with existing identity providers. o Low cost but high functionality: OAuth is an open standard with widely available libraries and support, making it a cost-effective solution with a high level of functionality.

SAML is an open standard for Authentication and Authorization Rapid Authentication Flexible Authorization via attribute statements in assertions. Ease of Deployment with widespread support and available tools. Low Cost and High Functionality as an open standard with robust features. Why Not OAuth: OAuth provides delegated authorization. Does not handle user authentication on its own; it relies on an authentication mechanism like OpenID Connect. Without OpenID Connect, OAuth cannot fulfill the authentication requirement specified, and OpenID is not a choice here.

The best answer is D. OAuth. OAuth provides a cost-effective, flexible, and easy-to-deploy authentication scheme that allows for rapid authentication and flexible authorization, making it well-suited for web-based applications.