Learn the basics of SAML authentication for Enterprise SSO. Understand IdP vs SP roles, XML assertions, and how to secure your B2B infrastructure effectively.

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SAML (Security Assertion Markup Language) enables secure single sign-on by separating authentication from application access. The protocol involves three key players: the user (Principal), Identity Provider (IdP) that verifies credentials, and Service Provider (SP) that grants access based on signed XML assertions. SAML assertions contain authentication statements, user attributes, and digital signatures verified through pre-configured trust relationships using certificates. Enterprise organizations require SAML support for centralized access control, reducing password-related help desk calls by up to 40%. Common implementation pitfalls include clock skew between servers, weak signature validation, and certificate expiration. While OpenID Connect suits modern mobile apps, SAML remains the enterprise standard for B2B SaaS applications.

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