Enroll, and Authentication Will Follow - eID-Based Enrollment for a Customized, Secure, and Frictionless Authentication Experience.

High-assurance user identification and credentials provisioning are crucial for accessing digital services. Usability, service customization, and security should be carefully balanced to offer an appropriate user experience. We propose an eID-based enrollment approach for tailoring authentication to the particular needs of the service provider and strike a good trade-off between usability and security via the registration of authenticators, artifacts providing identity proofs. We demonstrate the practicality of our approach in the case of patient access to Electronic Health Records (EHR) through an Android application: enrollment is done by using the Italian national eID card to register the mobile authenticator, unlocked by the user's fingerprint, customized to interact with the identity and access management system of the EHR.