Mahesh Jethanandani has entered the following ballot position for
draft-ietf-uta-tls13-iot-profile-23: No Objection

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COMMENT:
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Roman's COMMENT flags RFC 7452 as apparently unused. I did a full pass
over the body text and agree — I don't see it cited anywhere outside the
reference list. Should come out, or get an in-text citation if one was
intended.

---

On Ketan's reference-classification DISCUSS: I think he's on solid ground
for RFC 7301 and RFC 7250, but RFC 6066 strikes me as a different case.

Section 12:

504 >    Implementations conforming to this profile MUST support ALPN.

A MUST-level requirement to support an extension defined entirely in
RFC 7301 is about as clean a case for "normative" as reference
classification gets. Something similar applies to RFC 7250, given the
MUST-level digital-signature and key-exchange requirements this profile
attaches to raw-public-key support in Section 3.

RFC 6066, though, at least for me, only shows up in MAY-level, illustrative 
contexts —
the Trusted CA Indication extension and the client certificate URL
mechanism in Section 19 are both explicitly optional, deployment-specific
techniques, not things a compliant implementation has to do. RFC 6066
should stay informative.

---

Section 17.1.3, close to Roman's question about "or stronger" being
unclear:

655 >    The signature MUST be ecdsa-with-SHA256 or stronger [RFC5758].

I checked RFC 5758 directly: it defines ecdsa-with-SHA224/256/384/512 as
four distinct algorithm identifiers but doesn't itself establish a
strength ordering among them — it points out to NIST SP 800-57 for that.
So "or stronger" isn't a term RFC 5758 defines; the ordering is imported
from outside the cited reference. Not wrong, but worth being explicit
that "stronger" means "a SHA-2 variant with a longer digest," since
that's not spelled out here or in RFC 5758 itself.



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