What is single sign on (SSO) and how does it work?

Single Sign-On (SSO) is a system that allows users to authenticate across multiple applications using a single set of credentials, managed by an Identity Provider (IdP), which enhances security by reducing the need for multiple passwords and mitigates risks associated with password reuse. It operates by redirecting users from a Service Provider (SP) to an IdP for authentication and back with an authentication token, simplifying user access while maintaining security protocols. SSO is particularly useful for B2B companies, where it centralizes user identity management through a workforce IdP, streamlining administrative tasks like onboarding and access revocation. Common protocols used in SSO include OpenID Connect (OIDC) and SAML, with OAuth being a subset that facilitates SSO through providers like Google. However, implementing SSO involves challenges such as ensuring correct redirection URLs, managing multiple IdPs or protocols, and avoiding over-reliance on IdP-provided identity information. Stytch offers solutions to simplify SSO integration for companies, accommodating complex enterprise requirements without extensive development effort.

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