User Apps with Identifiers

Full Title

This article addresses the various solutions to creation of a synchronized Identifier between a user app and a Relying Party

The example addressed here is a Smartphone app that is uses to establish a user's identifier with a Website over the internet.

The user needs to trust that the app will honor the user's wishes.
The web site needs to trust that the app correctly informs it of the user's preferred identifier with:
1. the appropriate Identity Assurance Level (IAL) aka identity proofing.
2. the appropriate Authentication Assurance Level (AAL) aka proof of presence and control by the user.
3. the appropriate Federation Assurance Level (FAL) aka follows the federation rule and regulations.

Two major category of app are consider along with a hybrid that lies between the two.

The app is loaded from a trusted app store and has full access to the features of the device.

The app is loaded from a trusted web site and has access to the service broker features in the DOM.

The app works with a