What is Trusted Authentication in SAP BO / BI ?

In SAP Business Intelligence , trusted authentication is about trusting the application server for authentication.
When a user logs in, the application server and SAP BI plateform establishes a trusted relationship. SAP BI/ BO trusts the underlying application server to perform authentication.

The application server passes a shared secret and a user ID to BI plateform. If the user ID exists in the BI system , a logon session for that user is created.