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Re: [webauthn] How "preferred" is a "preferred" resident key (#1463)

From: John Bradley via GitHub <sysbot+gh@w3.org>
Date: Fri, 31 Jul 2020 21:40:16 +0000
To: public-webauthn@w3.org
Message-ID: <issue_comment.created-667390327-1596231615-sysbot+gh@w3.org>
Platform authenticators on phones always have UV so you must be talking about roaming authenticators.

If there is no pin or uv provisioned then you can make with rk=true and it will work.   That is basically the same as uv preferred logic.   I think the only change with i) is that you want to treat uv as required if the platform can guide the user to set a pin or uv.

If CTAP2 is not supported or it is a U2F key then you have to make a rk=false credential.

Another question to consider. 
If preferred and credential storage is full should the platform try it as rk=true and if it gets a error retry rk=false?.

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