9.7 FAL3 With a Non-PKI Bound Authenticator

A subscriber has a hardware cryptographic authenticator that speaks the WebAuthn protocol. This authenticator is not tied to any PKI system, and the authenticator device presents completely different and unlinked verification keys to both the IdP and RP during its normal authentication process. This kind of authenticator can still be used at FAL3 as a bound authenticator.

In this example, when the subscriber uses this authentication device at the IdP, it presents proof of Key1. When the subscriber uses the same device at the RP, it presents proof of Key2. These are logically two separate authenticators, but from the perspective of the subscriber, they are using the same device in multiple places.

To start a federation transaction, the subscriber authenticates to the IdP using Key1. The IdP then creates an assertion that is flagged as FAL3. Since the IdP has no visibility into the existence and use of Key2, the assertion says that the subscriber is using a bound authenticator to reach FAL3. When the RP processes this assertion, the RP checks the RP subscriber account associated with the federated identifier in the assertion to find a bound authenticator for that account using Key2. The RP prompts the subscriber to authenticate using Key2. When that key is verified, the RP creates a secure session with the subscriber at FAL3.

1. Přehled

1.1 Odkazy

1.2 Identifikované požadavky

1.3 Související regulace

2. Identifikované požadavky

3. Související regulace

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