SSO protocols: SAML vs. OIDC

The blog post explores the differences between two prominent single sign-on (SSO) protocols, SAML (Security Assertion Markup Language) and OIDC (OpenID Connect), highlighting their unique features, use cases, and the contexts in which each is typically used. SAML, an XML-based protocol, is traditionally employed in enterprise environments, facilitating secure access across multiple applications without requiring separate credentials for each. In contrast, OIDC, built on OAuth 2.0, offers a more versatile and lightweight authentication solution suitable for modern web and mobile applications, using JSON for data exchange. The article discusses the core authentication flows of each protocol, their data formats, and security mechanisms, emphasizing the importance for B2B SaaS vendors to support both protocols to meet diverse customer needs. It also touches on the implementation flexibility provided by services like Stytch, which supports both SAML and OIDC, allowing businesses to cater to both consumer-facing and enterprise-facing applications.

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