+
+### What is Identity Brokering and Federated Identities?
+
+Federated identity management is an arrangement built upon the trust between two or more domains. Users of these domains are allowed to access applications and services using the same identity.
+This identity is known as federated identity and the pattern behind this as identity federation.
+
+A service provider that specializes in brokering access control between multiple service providers (also referred to as relying parties) is called identity broker.
+Federated identity management is an arrangement that is made between two or more such identity brokers across organizations.
+
+Example:
+If Google is configured as identity provider on your organization, the user will get the option to use his Google Account on the Login Screen of ZITADEL (1).
+ZITADEL will redirect the user to the login screen of Google where he as to authenticated himself (2) and is sent back after he has finished that (3).
+Because Google is registered as trusted identity provider the user will be able to login in with the Google account after he linked an existing ZITADEL Account or just registered a new one with the claims provided by Google (4)(5).
+
+
+
+
+
+ Identity Brokering
+
+
+### Exercise: Register an external identity provider
+
+In this exercise we will add a new Google identity provider to federate identities with ZITADEL.
+
+#### 1. Create new OIDC Client
+
+1. Register an OIDC Client in your preferred provider
+2. Make sure you add the ZITADEL callback redirect uris
+ https://accounts.zitadel.ch/register/externalidp/callback
+ https://accounts.zitadel.ch/login/externalidp/callback
+
+> **Information:** Make sure the provider is OIDC 1.0 compliant with a proper Discovery Endpoint
+
+Google Example:
+1. Go to the Google Gloud Platform and choose youre project: https://console.cloud.google.com/apis/credentials
+2. Click on "+ CREATE CREDENTIALS" and choose "OAuth client ID"
+3. Choose Web application as Application type and give a name
+4. Add the redirect uris from above
+5. Save clientid and client secret
+
+
+
+
+
+ Add new oAuth credentials in Google Console
+
+
+#### 2. Add custom login policy on your organisation
+
+1. Go to your organisation settings by clicking on "Organisation" in the menu or using the following link: https://console.zitadel.ch/org
+2. Modify your login policy
+3. As long as you have the default policy, you can't change the policy. Click create custom policy to set your on settings.
+
+
+
+
+
+ Add custom login policy
+
+
+#### 3.Configure new identity provider
+
+1. Go to the identity providers section and click new
+2. Fill out the form
+ - Use the issuer, clientid and client secret provided by your provider
+ - The scopes will be prefilled with openid, profile and email, because this information is relevant for ZITADEL
+ - You can choose what fields you like to map as the display name and as username. The fields you can choose are preferred_username and email
+ (Example: For Google you should choose email for both fields)
+3. Save your configuration
+4. Link your new configuration to your login policy. By searching in the organisation category you will get you own configuration. If you choose system you can link all predefined providers.
+
+
+
+
+
+ Configure identity provider
+
+
+Your user will now be able to choose Google for login instead of username/password or mfa.
+
+### Knowledge Check
+
+* The issuer for your identity provider is https://issuer.zitadel.ch
+ - [ ] yes
+ - [ ] no
+* The identity provider has to be oAuth 2.0 compliant
+ - [ ] yes
+ - [ ] no
+
+
+
+
+ Solutions
+
+
+* The issuer for your identity provider is https://issuer.zitadel.ch
+ - [ ] yes
+ - [x] no (The issuer is provided by your choosen identity provider. In the case of Google it's https://accounts.google.com)
+* The identity provider has to be oAuth 2.0 compliant
+ - [x] yes
+ - [ ] no
+
+
+
+
+### Summary
+
+* You can federate identities of all oAuth 2.0 compliant external identity providers
+* Configure the provider in your custom login policy
+
+Where to go from here:
+* ZITADEL Projects
+* Service users
diff --git a/site/guides/400-guide-identity-brokering.md b/site/guides/400-guide-identity-brokering.md
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+---
+title: Identity Brokering
+subtitle: Add an external Identity Provider to manage federated identities. (e.g Goggle)
+img: logos/zitadel-logo-solo-darkdesign.svg
+date: 09. April 2021
+readingtime: 15min
+route: guide-identity-brokering
+visible: true
+tags: developer, organisation manager
+---
+
+Learn about identity brokering/federation and how to add an external identity provider to authenticate your users. Example with Google Identities.
\ No newline at end of file
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