SSO — Single Sign-On
Definition
An authentication scheme that allows users to log in to multiple applications using a single set of credentials.
Context & Usage
SSO improves user experience and security (centralized password policies, audit). Common SSO protocols: SAML 2.0 (enterprise), OAuth 2.0 / OpenID Connect (web/mobile). Major SSO platforms: Okta, Auth0, Microsoft Entra ID, Google Workspace, Active Directory Federation Services.
Examples
- Okta SSO integrating Salesforce, Slack, Jira
- Microsoft Entra ID for Office 365 + 3rd-party SaaS
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