Supponendo che il dispositivo supporti la generazione e l'utilizzo di più chiavi, l'identificazione delle informazioni non è condivisa tra i servizi mediante l'utilizzo di U2F.
Probabilmente troverai il seguente commento da Yubico per essere interessante:
Each user can also choose to have multiple identities, including
anonymous (no personal information associated with the identity). A
U2F device generates a new pair of keys for every service, the public
key is only stored on the specific service it connects to. With this
approach no secrets are shared among service providers, and even
low-cost U2F devices can support any number of services.
Le domande frequenti di Google riguardanti i dispositivi U2F forniscono una risposta simile:
Is my privacy protected when I use my Security Key with multiple websites?
Since a Security Key can work with multiple websites, the FIDO U2F
protocol was designed from the ground-up to ensure user privacy. A
Security Key device cannot be queried for a unique identifier that
could be used to track a user across multiple sites. Instead, a
Security Key registers a unique credential with each website that it’s
used with. These credentials are designed such that the websites
cannot "compare notes" and identify the same user across websites by
their Security Key.