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How did the service authenticate the user in order to create the new credential within the attacker-controlled app?
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With banks, typically a combination of your account number, pin and some confirmation code sent via email or SMS. And of course unregistering your previous device. Not sure where you're going with this though?
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I am just pointing out that you are essentially saying passkeys can be phished because banks can allow phishable credentials to bypass passkeys.
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