Single Sign-On (SSO) is an authentication mechanism that allows users to log in once and gain access to multiple applications or services without needing to re-enter their credentials. It enhances security and improves user experience by reducing password fatigue.
How SSO Works
User Authentication:
- The user logs in once using a central authentication provider (e.g., Google, Microsoft, Okta).
Token Generation:
- The system generates a secure token that verifies the user’s identity.
Access to Services:
- The token is passed to other connected applications, granting access without additional logins.
Session Management:
- The session remains active until the user logs out or the token expires.
Common SSO Implementations
- OAuth (Used for third-party logins like Google or Facebook)
- SAML (Security Assertion Markup Language) (Common in enterprise environments)
- OpenID Connect (OIDC) (Built on OAuth for authentication)
Examples of SSO in Action
- Google Account: A single login grants access to Gmail, Drive, YouTube and more.
- Microsoft SSO: One login for Office 365, Teams and OneDrive.
- Corporate SSO: Employees log in once to access HR systems, email and collaboration tools.