Software Design

SAML 2.0 SSO: Enterprise Identity Exchange

UML Sequence Diagrams · made in Skemio

Sequence diagram showing SAML 2.0 SSO authentication between User Browser, Service Provider, and Identity Provider.
Sequence diagram showing SAML 2.0 SSO authentication between User Browser, Service Provider, and Identity Provider.
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What it shows

  • Service Provider initiates login with a signed SAMLRequest redirect.
  • Identity Provider issues digitally signed XML assertions via user browser.
  • ACS validates signatures without direct backend SP-to-IdP connections.

The takeaway

SAML 2.0 delegates authentication to an enterprise IdP via signed XML assertions routed through the browser.

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