On Thursday, May 4, 2023 at 6:11:17 PM UTC-4 Adam Langley wrote:

On Tue, May 2, 2023 at 9:55 AM Caleb Raitto <[email protected]> wrote:

Thanks, makes sense -- can a note about this be added to the privacy 
section of the explainer / spec? 


I think the Privacy section covers that now. If you see gaps, please do 
let me know.


I was thinking we should have some language specifically about the 
cross-origin iframe case -- I didn't see that in the explainer or spec when 
I checked just now? Basically something like your previous response would 
be sufficient, I think?

Also, I wanted to clarify:

> The cross-origin iframe would still be limited by the RP ID mechanism 
<https://w3c.github.io/webauthn/#rp-id> so that it could only attempt to 
assert credentials created within the same eTLD+1, however.

IIUC, this means that the PRF value is more akin to a first party cookie 
than a third-party cookie?

Thanks, 
-Caleb
 



Cheers

AGL

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