A system that includes a memory to store registration information for a particular application hosted by a particular user device, where the registration information includes context information regarding the particular user device and an integrity code based on credentials associated with the particular application. The system also includes a first server to receive, from a second server, a request to receive a service on behalf of a user device that hosts an application, the request including other credentials associated with the application; generate, using a data integrity algorithm, another integrity code based on the other credentials; determine that the application is trusted when the integrity code matches the other integrity code; compare other context information associated with the user device with the context information when the application is trusted; and send an instruction to the user device to re-register the application when the context information does not match the other context information.