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Single Sign-On

Single sign-on lets users access applications through a centralized identity provider instead of separate passwords.

technicalPublished 2026/06/11Last verified 2026/07/17

Single sign-on, or SSO, lets users access multiple applications through a centralized identity provider. In healthcare AI procurement, SSO can support stronger authentication, user provisioning, access review, and termination workflows.

SSO does not solve all access risk. Buyers should also review role mapping, audit logs, least-privilege access, support access, and emergency access workflows.

Application scenario: In workflow review, this term helps teams map a vendor claim to the care setting, data flow, integration point, user handoff, and oversight step where it applies. Procurement impact: Buyers should evaluate evidence, interoperability effort, security and privacy controls, pricing assumptions, support, and compliance responsibilities before shortlisting or contracting for a tool that depends on this capability.

Sources and review notes

These links support definition-level research and do not establish the regulatory status, safety, or suitability of any product.

NIST SP 800-63-4 separates identity proofing, authentication and federation. SP 800-63C-4 defines federation as an identity provider sending an assertion about an authenticated subscriber to a relying party, which validates the assertion and creates its own session. SAML assertions and OpenID Connect ID tokens are examples, but protocol support alone does not establish the assurance, trust agreement, assertion protections or session behavior of an implementation. HHS Security Rule and risk-analysis guidance remains relevant when SSO controls access to ePHI for a covered entity or business associate. Buyers should verify supported identity providers and protocol profiles; issuer, audience, subject and account-linking rules; signing and encryption keys, rotation and metadata refresh; assertion expiry, replay and injection protection; MFA and phishing-resistant authentication requirements; step-up and reauthentication; requested attributes and privacy; group and role mapping; default-deny authorization; just-in-time or SCIM provisioning and deprovisioning; joiner, mover and leaver timing; local-account restrictions; administrator, service, integration and vendor-support identities; session lifetime, logout and revocation; emergency and downtime access; audit correlation; tenant separation; recovery and IdP outage procedures; and tests for disabled users, stale groups, forged or replayed assertions and identifier changes. SSO does not by itself provide identity proofing, MFA, least privilege, application authorization, automatic account removal, secure service accounts, audit review or HIPAA compliance.

FAQs

Is SSO enough for healthcare AI access control?
No. SSO helps centralize identity, but buyers still need role permissions, logging, support access controls, and access reviews.

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