Which authentication protocol is used by default in Sitefinity?

Sitefinity uses OpenID as its default authentication protocol. OpenID is an open standard for decentralized authentication that allows users to use their existing accounts from various providers to log in without needing to create a new account specifically for each application. This simplifies the user experience, as individuals can take advantage of a single set of credentials across multiple sites.

Additionally, OpenID is designed to enhance security by minimizing the need for users to remember multiple passwords, thus reducing potential vulnerabilities associated with account management.

The other protocols listed, while also relevant in the context of modern web applications, do not serve as the default authentication method within Sitefinity. SAML is typically used within enterprise environments for single sign-on (SSO) solutions, OAuth is a widely-used authorization framework that often works alongside OpenID but does not specifically address authentication, and JWT (JSON Web Tokens) serves as a means of representing claims securely between parties, commonly used after an authentication mechanism has been established.