From: Jeremy O'Donoghue <jodonogh@qti.qualcomm.com>
To: rats <rats@ietf.org>
Thread-Topic: CoRIM signing
Thread-Index: AQHc58/jYyGqGiLLhkaoKx0Wo0FeAQ==
Date: Tue, 19 May 2026 20:52:38 +0000
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--_000_DS4PR02MB10844919EA0D15D844AC65D23F2002DS4PR02MB10844na_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Hi CoRIM editors,

A couple of points on draft-ietf-rats-corim-10.

I believe there are valid use-cases for a Signed CoRIM to have multiple sig=
neds (i.e. allow COSE_Sign in addition to COSE_Sign1.

An example of such a use-case is a dual-signed artifact (e.g. signed by a s=
ilicon vendor and an OEM, or both classically and PQC signed). The alternat=
ive would be to produce separate sets of CoRIM with the same payload.

I believe this would be a straightforward change.

In addition, I have a question on the text:
The ref-claims in a reference-triple-record can contain one or more entries=
. This multiplicity can have different meanings:

  1.
Each ref-claims entry can represent a different possible state of the Envir=
onment.
  2.
Each ref-claims entry can represent a possible state of a different measure=
d element (identified by its mkey) within the Environment.

Note that the same semantics can be expressed using multiple Reference Valu=
e Triples.
Allowing different meanings for the same record seems like a recipe for int=
eroperability problems in future. Is there a good reason for this rather th=
an either defining a new triple (dependent-value-triple-record) or simply u=
sing multiple reference-value-triples.

Best regards
Jeremy

--_000_DS4PR02MB10844919EA0D15D844AC65D23F2002DS4PR02MB10844na_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Hi CoRIM editors,</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
A couple of points on draft-ietf-rats-corim-10.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
I believe there are valid use-cases for a Signed CoRIM to have multiple sig=
neds (i.e. allow COSE_Sign in addition to COSE_Sign1.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
An example of such a use-case is a dual-signed artifact (e.g. signed by a s=
ilicon vendor and an OEM, or both classically and PQC signed). The alternat=
ive would be to produce separate sets of CoRIM with the same payload.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
I believe this would be a straightforward change.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
In addition, I have a question on the text:</div>
<div id=3D"section-5.1.5-8" class=3D"elementToProof" style=3D"text-align: l=
eft; text-indent: 0px; margin: 20.8px 0px 20.8px 3ch; font-family: Aptos, A=
ptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; fon=
t-size: 12pt; color: rgb(0, 0, 0);">
The <code style=3D"font-family: &quot;Noto Sans Mono&quot;, SFMono-Regular,=
 Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&qu=
ot;, monospace;">
ref-claims</code>&nbsp;in a&nbsp;<code style=3D"font-family: &quot;Noto San=
s Mono&quot;, SFMono-Regular, Menlo, Monaco, Consolas, &quot;Liberation Mon=
o&quot;, &quot;Courier New&quot;, monospace;">reference-triple-record</code=
>&nbsp;can contain one or more entries. This multiplicity can have differen=
t meanings:</div>
<ol start=3D"1" style=3D"text-align: left; margin: 0px 0px 0px 6ch; padding=
-left: 0px;">
<li style=3D"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, C=
alibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); margin=
: 20.8px 0px;">
<div id=3D"section-5.1.5-9.1.1" class=3D"elementToProof" role=3D"presentati=
on" style=3D"margin: 0px;">
Each <code style=3D"font-family: &quot;Noto Sans Mono&quot;, SFMono-Regular=
, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&q=
uot;, monospace;">
ref-claims</code>&nbsp;entry can represent a different possible state of th=
e Environment.</div>
</li><li style=3D"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontServi=
ce, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); m=
argin: 20.8px 0px;">
<div id=3D"section-5.1.5-9.2.1" class=3D"elementToProof" role=3D"presentati=
on" style=3D"margin: 0px;">
Each <code style=3D"font-family: &quot;Noto Sans Mono&quot;, SFMono-Regular=
, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&q=
uot;, monospace;">
ref-claims</code>&nbsp;entry can represent a possible state of a different =
measured element (identified by its
<code style=3D"font-family: &quot;Noto Sans Mono&quot;, SFMono-Regular, Men=
lo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&quot;,=
 monospace;">
mkey</code>) within the Environment.</div>
</li></ol>
<div id=3D"section-5.1.5-10" class=3D"elementToProof" style=3D"text-align: =
left; text-indent: 0px; margin: 20.8px 0px 20.8px 3ch; font-family: Aptos, =
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Note that the same semantics can be expressed using multiple Reference Valu=
e Triples.</div>
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nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Allowing different meanings for the same record seems like a recipe for int=
eroperability problems in future. Is there a good reason for this rather th=
an either defining a new triple (dependent-value-triple-record) or simply u=
sing multiple reference-value-triples.</div>
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nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
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nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Best regards</div>
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nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Jeremy</div>
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