Re: [webauthn] Hybrid transport opt-out and ability for verifiable proof (#2349)

> The only viable option is attestation - this allows you to precisely control the authenticators in use

@Firstyear why should that technically prevent the hybrid flow?

From my point of view the Authenticator is not necessarily aware **how** the CTAP messages are transported to the Authenticator. Even if its an attested USB Security Key, CTAP Messages might be relayed by the Operating System through a different channel beforehand (hybrid flow) and finally sent via USB to the Security Key.

I tested exactly that scenario on Android. After you scanned the qr code with your Android phone you are able to select a Security Key to complete the authentication.

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Received on Saturday, 25 October 2025 08:24:29 UTC