US Patent 11968209 Hybrid authentication systems and methods

Disclosed are hybrid authentication systems and methods that enable users to seamlessly sign-on between cloud-based services and on-premises systems. A cloud-based authentication service receives login credentials from a user and delegates authentication to an on-premises authentication service proxy. The login credentials can be passed by the cloud-based authentication service to the on-premises authentication service proxy, for instance, as an access token in an authentication header. The access token can be a JavaScript Object Notation (JSON) Web Token (JWT) token that is digitally signed using JSON Web Signature. Some embodiments utilize a tunnel connection through which the cloud-based authentication service communicates with the on-premises authentication service proxy. Some embodiments leverage an on-premises identity management system for user management and authentication. In this way, there is no need for a cloud-based system to separately maintain and manage a user identity management system and/or having to sync with an on-premises identity management system.