Thanks for this work.  It is clear, readable, and compelling. I was already
leery about QR codes, and now?

Here are some minor comments followed by a list of nits:

I did a quick idnits check (I used the v3 experimental one) and a couple of
things popped up which you need to fix.  Both Security Considerations and
IANA Considerations are required sections.  For IANA Con you should say:
“This document has no IANA actions.” For Security Considerations you can do
something similar, or you can do something different (maybe modify the
Conclusion?).  The other thing that popped up were some 'SHOULD not' type
language.  Obviously these should be 'SHOULD NOT'.

Section 3, para 1, last sentence:  [this is very minor]  I had trouble
understanding the last phrase of this sentence.  Does 'before potentially
passing control between the two devices' mean the same thing?  The rest of
the para discusses transferring the session from device 1 to device 2, but
the last phrase of the last sentence reads like passing control from device
2 back to device 1.  Or make it more clear that there are two
use cases.

Section 6.1.1, physical connectivity (and others), last sentence:  This
appears to be tacked on to the end of this paragraph and it appears in more
than one section on proximity (not necessarily in the same form).  Can we
move it up into the first paragraph of Section 6.1.1 (perhaps adding a
paragraph there - before the mitigations)?   Maybe as a note, since this
section/set of mitigations are about the channel between Consumption Device
and Authorization Device (not the Authentication server).

Section 6.1.15:  Isn't there a limitation where the Consumption Device does
not have sufficient input capabilities to support phishing resistant auth
mechanisms?  (this is stated in the first paragraph, but it is also (?) a
limitation.

Nits:
Section 2, sentence 1:  protools/protocols
Section 2, para 1, last sentence:  writing/this specification (or this
writing)
Section 4, sentence 1:  typicaly/typically
Section 5, last para:  SHOULD not/SHOULD NOT
Section 6.1.7, para 2:  intractive/interactive

Deb Cooley
Sec AD
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