4.4 Single Sign-On (SSO) Explained
Key Concepts
Single Sign-On (SSO) is an authentication process that allows a user to access multiple applications and services with a single set of credentials. Key concepts include the SSO process, identity providers, and service providers.
SSO Process
The SSO process involves a user logging in once to an identity provider (IdP) and then being authenticated automatically to access various service providers (SPs) without needing to re-enter credentials.
Example: A user logs into their corporate network using their username and password. Once authenticated, they can access multiple internal applications such as email, HR portal, and project management tools without needing to log in again.
Identity Providers (IdP)
An Identity Provider is a system entity that creates, maintains, and manages identity information for principals and provides principal authentication to other service providers within a federation or distributed network.
Example: Microsoft Active Directory Federation Services (AD FS) acts as an IdP for a company. When employees log in to AD FS, it provides authentication tokens that allow them to access various cloud services like Office 365 and Salesforce.
Service Providers (SP)
A Service Provider is an entity that provides services to principals and relies on an IdP to authenticate those principals. SPs trust the IdP to provide accurate and secure authentication information.
Example: Google Workspace is an SP that relies on an IdP like Okta for user authentication. When a user logs into Okta, they can access Google Workspace services like Gmail and Google Drive without needing to log in separately.
Conclusion
Single Sign-On (SSO) simplifies the authentication process for users by allowing them to access multiple applications with a single set of credentials. By understanding the SSO process, identity providers, and service providers, organizations can enhance security and improve user experience.