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63 changes: 49 additions & 14 deletions draft-birkholz-rats-epoch-markers.html
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<meta content='
This document defines Epoch Markers as a way to establish a notion of freshness among actors in a distributed system. Epoch Markers are similar to "time ticks" and are produced and distributed by a dedicated system, the Epoch Bell. Systems that receive Epoch Markers do not have to track freshness using their own understanding of time (e.g., via a local real-time clock). Instead, the reception of a certain Epoch Marker establishes a new epoch that is shared between all recipients.
' name="description">
<meta content="xml2rfc 3.18.1" name="generator">
<meta content="xml2rfc 3.18.2" name="generator">
<meta content="Internet-Draft" name="keyword">
<meta content="draft-birkholz-rats-epoch-markers-latest" name="ietf.draft">
<!-- Generator version information:
xml2rfc 3.18.1
Python 3.11.5
xml2rfc 3.18.2
Python 3.11.6
ConfigArgParse 1.5.3
google-i18n-address 3.1.0
intervaltree 3.1.0
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</tr></thead>
<tfoot><tr>
<td class="left">Birkholz, et al.</td>
<td class="center">Expires 14 April 2024</td>
<td class="center">Expires 25 April 2024</td>
<td class="right">[Page]</td>
</tr></tfoot>
</table>
Expand All @@ -1045,12 +1045,12 @@
<dd class="internet-draft">draft-birkholz-rats-epoch-markers-latest</dd>
<dt class="label-published">Published:</dt>
<dd class="published">
<time datetime="2023-10-12" class="published">12 October 2023</time>
<time datetime="2023-10-23" class="published">23 October 2023</time>
</dd>
<dt class="label-intended-status">Intended Status:</dt>
<dd class="intended-status">Standards Track</dd>
<dt class="label-expires">Expires:</dt>
<dd class="expires"><time datetime="2024-04-14">14 April 2024</time></dd>
<dd class="expires"><time datetime="2024-04-25">25 April 2024</time></dd>
<dt class="label-authors">Authors:</dt>
<dd class="authors">
<div class="author">
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."<a href="#section-boilerplate.1-3" class="pilcrow"></a></p>
<p id="section-boilerplate.1-4">
This Internet-Draft will expire on 14 April 2024.<a href="#section-boilerplate.1-4" class="pilcrow"></a></p>
This Internet-Draft will expire on 25 April 2024.<a href="#section-boilerplate.1-4" class="pilcrow"></a></p>
</section>
</div>
<div id="copyright">
Expand Down Expand Up @@ -1196,6 +1196,9 @@ <h2 id="name-copyright-notice">
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.1">
<p id="section-toc.1-1.6.2.1.1"><a href="#section-6.1" class="auto internal xref">6.1</a>.  <a href="#name-new-cbor-tags" class="internal xref">New CBOR Tags</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.2">
<p id="section-toc.1-1.6.2.2.1"><a href="#section-6.2" class="auto internal xref">6.2</a>.  <a href="#name-new-em-cwt-claim" class="internal xref">New EM CWT Claim</a></p>
</li>
</ul>
</li>
Expand Down Expand Up @@ -1299,7 +1302,7 @@ <h2 id="name-interaction-models">
Using an Epoch Marker requires the challenger to acquire an Epoch Marker beforehand, which may introduce a sensible overhead compared to using a simple nonce.<a href="#section-3-3" class="pilcrow"></a></p>
</section>
</div>
<div id="epoch-marker-structure">
<div id="sec-epoch-markers">
<section id="section-4">
<h2 id="name-epoch-marker-structure">
<a href="#section-4" class="section-number selfRef">4. </a><a href="#name-epoch-marker-structure" class="section-name selfRef">Epoch Marker Structure</a>
Expand Down Expand Up @@ -1351,7 +1354,7 @@ <h4 id="name-cbor-time-tags">
<a href="#section-4.1.1" class="section-number selfRef">4.1.1. </a><a href="#name-cbor-time-tags" class="section-name selfRef">CBOR Time Tags</a>
</h4>
<p id="section-4.1.1-1">A CBOR time representation choosing from CBOR tag 0 (tdate, RFC3339 time as a string), tag 1 (time, Posix time as int or float) or tag 1001 (extended time data item), optionally bundled with a nonce.<a href="#section-4.1.1-1" class="pilcrow"></a></p>
<p id="section-4.1.1-2">See <span><a href="https://datatracker.ietf.org/doc/html/draft-ietf-cbor-time-tag-10#section-3" class="relref">Section 3</a> of [<a href="#I-D.ietf-cbor-time-tag" class="cite xref">I-D.ietf-cbor-time-tag</a>]</span> for the (many) details about the CBOR extended
<p id="section-4.1.1-2">See <span><a href="https://datatracker.ietf.org/doc/html/draft-ietf-cbor-time-tag-11#section-3" class="relref">Section 3</a> of [<a href="#I-D.ietf-cbor-time-tag" class="cite xref">I-D.ietf-cbor-time-tag</a>]</span> for the (many) details about the CBOR extended
time format (tag 1001). See <span>[<a href="#STD94" class="cite xref">STD94</a>]</span> for tdate (tag 0) and time (tag 1).<a href="#section-4.1.1-2" class="pilcrow"></a></p>
<div class="lang-CDDL sourcecode" id="section-4.1.1-3">
<pre>
Expand Down Expand Up @@ -1542,7 +1545,7 @@ <h4 id="name-cbor-encoded-rfc3161-tst-in">
<dd class="break"></dd>
<dt id="section-4.1.3-7.5">tsa:</dt>
<dd style="margin-left: 1.5em" id="section-4.1.3-7.6">
<p id="section-4.1.3-7.6.1">a single-entry GeneralNames array <span><a href="https://datatracker.ietf.org/doc/html/draft-ietf-cose-cbor-encoded-cert-06#section-11.8" class="relref">Section 11.8</a> of [<a href="#I-D.ietf-cose-cbor-encoded-cert" class="cite xref">I-D.ietf-cose-cbor-encoded-cert</a>]</span> providing a hint
<p id="section-4.1.3-7.6.1">a single-entry GeneralNames array <span><a href="https://datatracker.ietf.org/doc/html/draft-ietf-cose-cbor-encoded-cert-07#section-11.8" class="relref">Section 11.8</a> of [<a href="#I-D.ietf-cose-cbor-encoded-cert" class="cite xref">I-D.ietf-cose-cbor-encoded-cert</a>]</span> providing a hint
in identifying the name of the TSA. Cf. tsa, <span><a href="https://rfc-editor.org/rfc/rfc3161#section-2.4.2" class="relref">Section 2.4.2</a> of [<a href="#RFC3161" class="cite xref">RFC3161</a>]</span>.<a href="#section-4.1.3-7.6.1" class="pilcrow"></a></p>
</dd>
<dd class="break"></dd>
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</div>
</section>
</div>
<div id="sec-iana-em-claim">
<section id="section-6.2">
<h3 id="name-new-em-cwt-claim">
<a href="#section-6.2" class="section-number selfRef">6.2. </a><a href="#name-new-em-cwt-claim" class="section-name selfRef">New EM CWT Claim</a>
</h3>
<p id="section-6.2-1">This specification adds the following value to the "CBOR Web Token Claims" registry <span>[<a href="#IANA.cwt" class="cite xref">IANA.cwt</a>]</span>.<a href="#section-6.2-1" class="pilcrow"></a></p>
<ul class="normal">
<li class="normal" id="section-6.2-2.1">
<p id="section-6.2-2.1.1">Claim Name: em<a href="#section-6.2-2.1.1" class="pilcrow"></a></p>
</li>
<li class="normal" id="section-6.2-2.2">
<p id="section-6.2-2.2.1">Claim Description: Epoch Marker<a href="#section-6.2-2.2.1" class="pilcrow"></a></p>
</li>
<li class="normal" id="section-6.2-2.3">
<p id="section-6.2-2.3.1">Claim Key: 2000<a href="#section-6.2-2.3.1" class="pilcrow"></a></p>
</li>
<li class="normal" id="section-6.2-2.4">
<p id="section-6.2-2.4.1">Claim Value Type(s): CBOR array<a href="#section-6.2-2.4.1" class="pilcrow"></a></p>
</li>
<li class="normal" id="section-6.2-2.5">
<p id="section-6.2-2.5.1">Change Controller: IESG<a href="#section-6.2-2.5.1" class="pilcrow"></a></p>
</li>
<li class="normal" id="section-6.2-2.6">
<p id="section-6.2-2.6.1">Specification Document(s): <a href="#sec-epoch-markers" class="auto internal xref">Section 4</a> of RFCthis<a href="#section-6.2-2.6.1" class="pilcrow"></a></p>
</li>
</ul>
</section>
</div>
</section>
</div>
<section id="section-7">
Expand All @@ -1770,11 +1801,11 @@ <h3 id="name-normative-references">
<dl class="references">
<dt id="I-D.ietf-cbor-time-tag">[I-D.ietf-cbor-time-tag]</dt>
<dd>
<span class="refAuthor">Bormann, C.</span>, <span class="refAuthor">Gamari, B.</span>, and <span class="refAuthor">H. Birkholz</span>, <span class="refTitle">"Concise Binary Object Representation (CBOR) Tags for Time, Duration, and Period"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-cbor-time-tag-10</span>, <time datetime="2023-10-07" class="refDate">7 October 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-cbor-time-tag-10">https://datatracker.ietf.org/doc/html/draft-ietf-cbor-time-tag-10</a>&gt;</span>. </dd>
<span class="refAuthor">Bormann, C.</span>, <span class="refAuthor">Gamari, B.</span>, and <span class="refAuthor">H. Birkholz</span>, <span class="refTitle">"Concise Binary Object Representation (CBOR) Tags for Time, Duration, and Period"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-cbor-time-tag-11</span>, <time datetime="2023-10-22" class="refDate">22 October 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-cbor-time-tag-11">https://datatracker.ietf.org/doc/html/draft-ietf-cbor-time-tag-11</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="I-D.ietf-cose-cbor-encoded-cert">[I-D.ietf-cose-cbor-encoded-cert]</dt>
<dd>
<span class="refAuthor">Mattsson, J. P.</span>, <span class="refAuthor">Selander, G.</span>, <span class="refAuthor">Raza, S.</span>, <span class="refAuthor">Höglund, J.</span>, and <span class="refAuthor">M. Furuhed</span>, <span class="refTitle">"CBOR Encoded X.509 Certificates (C509 Certificates)"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-cose-cbor-encoded-cert-06</span>, <time datetime="2023-07-07" class="refDate">7 July 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-cose-cbor-encoded-cert-06">https://datatracker.ietf.org/doc/html/draft-ietf-cose-cbor-encoded-cert-06</a>&gt;</span>. </dd>
<span class="refAuthor">Mattsson, J. P.</span>, <span class="refAuthor">Selander, G.</span>, <span class="refAuthor">Raza, S.</span>, <span class="refAuthor">Höglund, J.</span>, and <span class="refAuthor">M. Furuhed</span>, <span class="refTitle">"CBOR Encoded X.509 Certificates (C509 Certificates)"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-cose-cbor-encoded-cert-07</span>, <time datetime="2023-10-20" class="refDate">20 October 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-cose-cbor-encoded-cert-07">https://datatracker.ietf.org/doc/html/draft-ietf-cose-cbor-encoded-cert-07</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="IANA.cbor-tags">[IANA.cbor-tags]</dt>
<dd>
Expand Down Expand Up @@ -1835,15 +1866,19 @@ <h3 id="name-informative-references">
<dd class="break"></dd>
<dt id="I-D.ietf-rats-eat">[I-D.ietf-rats-eat]</dt>
<dd>
<span class="refAuthor">Lundblade, L.</span>, <span class="refAuthor">Mandyam, G.</span>, <span class="refAuthor">O'Donoghue, J.</span>, and <span class="refAuthor">C. Wallace</span>, <span class="refTitle">"The Entity Attestation Token (EAT)"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-rats-eat-21</span>, <time datetime="2023-06-30" class="refDate">30 June 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat-21">https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat-21</a>&gt;</span>. </dd>
<span class="refAuthor">Lundblade, L.</span>, <span class="refAuthor">Mandyam, G.</span>, <span class="refAuthor">O'Donoghue, J.</span>, and <span class="refAuthor">C. Wallace</span>, <span class="refTitle">"The Entity Attestation Token (EAT)"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-rats-eat-22</span>, <time datetime="2023-10-14" class="refDate">14 October 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat-22">https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat-22</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="I-D.ietf-rats-reference-interaction-models">[I-D.ietf-rats-reference-interaction-models]</dt>
<dd>
<span class="refAuthor">Birkholz, H.</span>, <span class="refAuthor">Eckel, M.</span>, <span class="refAuthor">Pan, W.</span>, and <span class="refAuthor">E. Voit</span>, <span class="refTitle">"Reference Interaction Models for Remote Attestation Procedures"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-rats-reference-interaction-models-08</span>, <time datetime="2023-09-10" class="refDate">10 September 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-rats-reference-interaction-models-08">https://datatracker.ietf.org/doc/html/draft-ietf-rats-reference-interaction-models-08</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="I-D.ietf-scitt-architecture">[I-D.ietf-scitt-architecture]</dt>
<dd>
<span class="refAuthor">Birkholz, H.</span>, <span class="refAuthor">Delignat-Lavaud, A.</span>, <span class="refAuthor">Fournet, C.</span>, <span class="refAuthor">Deshpande, Y.</span>, and <span class="refAuthor">S. Lasker</span>, <span class="refTitle">"An Architecture for Trustworthy and Transparent Digital Supply Chains"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-scitt-architecture-02</span>, <time datetime="2023-07-10" class="refDate">10 July 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-scitt-architecture-02">https://datatracker.ietf.org/doc/html/draft-ietf-scitt-architecture-02</a>&gt;</span>. </dd>
<span class="refAuthor">Birkholz, H.</span>, <span class="refAuthor">Delignat-Lavaud, A.</span>, <span class="refAuthor">Fournet, C.</span>, <span class="refAuthor">Deshpande, Y.</span>, and <span class="refAuthor">S. Lasker</span>, <span class="refTitle">"An Architecture for Trustworthy and Transparent Digital Supply Chains"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-scitt-architecture-03</span>, <time datetime="2023-10-16" class="refDate">16 October 2023</time>, <span>&lt;<a href="https://datatracker.ietf.org/doc/html/draft-ietf-scitt-architecture-03">https://datatracker.ietf.org/doc/html/draft-ietf-scitt-architecture-03</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="IANA.cwt">[IANA.cwt]</dt>
<dd>
<span class="refAuthor">IANA</span>, <span class="refTitle">"CBOR Web Token (CWT) Claims"</span>, <span>&lt;<a href="http://www.iana.org/assignments/cwt">http://www.iana.org/assignments/cwt</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC9334">[RFC9334]</dt>
<dd>
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47 changes: 34 additions & 13 deletions draft-birkholz-rats-epoch-markers.txt
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Expand Up @@ -5,12 +5,12 @@
RATS Working Group H. Birkholz
Internet-Draft Fraunhofer SIT
Intended status: Standards Track T. Fossati
Expires: 14 April 2024 Arm Limited
Expires: 25 April 2024 Arm Limited
W. Pan
Huawei Technologies
C. Bormann
Universität Bremen TZI
12 October 2023
23 October 2023


Epoch Markers
Expand Down Expand Up @@ -57,7 +57,7 @@ Status of This Memo
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."

This Internet-Draft will expire on 14 April 2024.
This Internet-Draft will expire on 25 April 2024.

Copyright Notice

Expand Down Expand Up @@ -92,6 +92,7 @@ Table of Contents
5. Security Considerations
6. IANA Considerations
6.1. New CBOR Tags
6.2. New EM CWT Claim
7. References
7.1. Normative References
7.2. Informative References
Expand Down Expand Up @@ -549,6 +550,23 @@ Table of Contents

Table 1: New CBOR Tags

6.2. New EM CWT Claim

This specification adds the following value to the "CBOR Web Token
Claims" registry [IANA.cwt].

* Claim Name: em

* Claim Description: Epoch Marker

* Claim Key: 2000

* Claim Value Type(s): CBOR array

* Change Controller: IESG

* Specification Document(s): Section 4 of RFCthis

7. References

7.1. Normative References
Expand All @@ -557,17 +575,17 @@ Table of Contents
Bormann, C., Gamari, B., and H. Birkholz, "Concise Binary
Object Representation (CBOR) Tags for Time, Duration, and
Period", Work in Progress, Internet-Draft, draft-ietf-
cbor-time-tag-10, 7 October 2023,
cbor-time-tag-11, 22 October 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-cbor-
time-tag-10>.
time-tag-11>.

[I-D.ietf-cose-cbor-encoded-cert]
Mattsson, J. P., Selander, G., Raza, S., Höglund, J., and
M. Furuhed, "CBOR Encoded X.509 Certificates (C509
Certificates)", Work in Progress, Internet-Draft, draft-
ietf-cose-cbor-encoded-cert-06, 7 July 2023,
ietf-cose-cbor-encoded-cert-07, 20 October 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-cose-
cbor-encoded-cert-06>.
cbor-encoded-cert-07>.

[IANA.cbor-tags]
IANA, "Concise Binary Object Representation (CBOR) Tags",
Expand Down Expand Up @@ -635,9 +653,9 @@ Table of Contents
[I-D.ietf-rats-eat]
Lundblade, L., Mandyam, G., O'Donoghue, J., and C.
Wallace, "The Entity Attestation Token (EAT)", Work in
Progress, Internet-Draft, draft-ietf-rats-eat-21, 30 June
2023, <https://datatracker.ietf.org/doc/html/draft-ietf-
rats-eat-21>.
Progress, Internet-Draft, draft-ietf-rats-eat-22, 14
October 2023, <https://datatracker.ietf.org/doc/html/
draft-ietf-rats-eat-22>.

[I-D.ietf-rats-reference-interaction-models]
Birkholz, H., Eckel, M., Pan, W., and E. Voit, "Reference
Expand All @@ -651,9 +669,12 @@ Table of Contents
Birkholz, H., Delignat-Lavaud, A., Fournet, C., Deshpande,
Y., and S. Lasker, "An Architecture for Trustworthy and
Transparent Digital Supply Chains", Work in Progress,
Internet-Draft, draft-ietf-scitt-architecture-02, 10 July
2023, <https://datatracker.ietf.org/doc/html/draft-ietf-
scitt-architecture-02>.
Internet-Draft, draft-ietf-scitt-architecture-03, 16
October 2023, <https://datatracker.ietf.org/doc/html/
draft-ietf-scitt-architecture-03>.

[IANA.cwt] IANA, "CBOR Web Token (CWT) Claims",
<http://www.iana.org/assignments/cwt>.

[RFC9334] Birkholz, H., Thaler, D., Richardson, M., Smith, N., and
W. Pan, "Remote ATtestation procedureS (RATS)
Expand Down

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