It’s really easy, I promise.

IdP Initiated SSO

So what exactly is IdP initiated SSO?

To put it in layman’s terms, it’s a Single Sign On flow that is initiated by the Identity Provider sending an unsolicited SAML response to the Service Provider.
For more clarification, here is a picture thats worth a thousand words:

Behind the Scenes

It’s really as simple as it seems. However there are a few security measures that are put in place to validate who the identity provider is.

  1. The IdP shares it’s public key, idp_public_key with the SP
  2. The IdP signs it’s SAML response with the private key pertaining to idp_public_key
  3. IdP sends SAML response to SP…

Jean Luis Urena

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store