[COSE] Review draft-ietf-cose-webauthn-algorithms-02.txt

[Jim Schaad <[e-mail]>]

1.  The document needs to have a short title added to it.

2. Abstract - The text "FIDO Alliance FIDO2 Client to Authenticator
Protocol" needs to get cleaned up.  It is not clear to me if FIDO2 is
supposed to be an abbreviation of the previous FIDO Alliance or not.  Flip
the sentence to use from or insert specification earlier.

3.  Section 1 - I am not sure why you are using the term "related" rather
than "the" in this section.  This seems to be different than the abstract in
that feature.  Relate makes me think that it is something that is different
but similar in this case.

4.  While I guess it is reasonable to have the description of why things are
not recommended in the security considerations, I myself would not really
think of them as such.  However not having a pointer from section 2 to that
information seems harsh as we are saying the are not recommended without
have a pointer to the discussion.

5.  I have problems with the following text: "Implementation of this
algorithm is RECOMMENDED because of its widespread use in decentralized
systems and those that chose it over the NIST curves."  Firstly, this is an
incorrect use of the RFC 2119 language, this is not a protocol statement.
Secondly, this is not what the recommended column in table 2 means and thus
is trying to overload that column with something that is not real.  Third,
the fact that people chose this over the NIST curves is not necessarily a
reason for the IETF to recommended it's implementation.  

6.  I still want to see in the text the reasoning behind not just using the
current ECDSA algorithm in COSE.  

7.  Add text on checking point is on the curve to section 5.4

-----Original Message-----
From: COSE <[e-mail]> On Behalf Of [e-mail]
Sent: Thursday, October 24, 2019 2:35 PM
To: [e-mail]
Cc: [e-mail]
Subject: [COSE] I-D Action: draft-ietf-cose-webauthn-algorithms-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the CBOR Object Signing and Encryption WG of
the IETF.

        Title           : COSE and JOSE Registrations for WebAuthn
Algorithms
        Author          : Michael B. Jones
	Filename        : draft-ietf-cose-webauthn-algorithms-02.txt
	Pages           : 13
	Date            : 2019-10-24

Abstract:
   The W3C Web Authentication (WebAuthn) specification and the FIDO
   Alliance FIDO2 Client to Authenticator Protocol (CTAP) specification
   use CBOR Object Signing and Encryption (COSE) algorithm identifiers.
   This specification registers the following algorithms in the IANA
   "COSE Algorithms" registry, which are used by WebAuthn and CTAP
   implementations: RSASSA-PKCS1-v1_5 using SHA-256, SHA-384, SHA-512,
   and SHA-1, and ECDSA using the secp256k1 curve and SHA-256.  It
   registers the secp256k1 elliptic curve in the IANA "COSE Elliptic
   Curves" registry.  Also, for use with JSON Object Signing and
   Encryption (JOSE), it registers the algorithm ECDSA using the
   secp256k1 curve and SHA-256 in the IANA "JSON Web Signature and
   Encryption Algorithms" registry and the secp256k1 elliptic curve in
   the IANA "JSON Web Key Elliptic Curve" registry.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-cose-webauthn-algorithms/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-cose-webauthn-algorithms-02
https://datatracker.ietf.org/doc/html/draft-ietf-cose-webauthn-algorithms-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-cose-webauthn-algorithms-02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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