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To: Andrei Popov <Andrei.Popov=40microsoft.com@dmarc.ietf.org>,
        "Scott Fluhrer (sfluhrer)" <sfluhrer=40cisco.com@dmarc.ietf.org>,
        Muhammad Usama Sardar <muhammad_usama.sardar@tu-dresden.de>,
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    <p>I also see the need for ML-DSA composite signatures in TLS and
      thus would support adoption of=C2=A0draft-reddy-tls-composite-mldsa=
=2E
      The demand for composite arises clearly in the European context,
      where =E2=80=93 as should be well known =E2=80=93 multiple national=
 information
      security authorities have set the use of PQ/T hybrids as the
      standard.</p>
    <p>Falko</p>
    <div class=3D"moz-cite-prefix">Am 13.04.26 um 18:30 schrieb Andrei
      Popov:<br>
    </div>
    <blockquote type=3D"cite"
cite=3D"mid:LV0PR21MB6623B48B1F3A05D745F5A79D8C242@LV0PR21MB6623.namprd21=
=2Eprod.outlook.com">
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      <div class=3D"WordSection1">
        <p class=3D"MsoNormal">Just to weigh in on this: I would support
          adoption of draft-reddy-tls-composite-mldsa. There is customer
          demand for composite certs, and I would like to get these
          implemented in the Windows TLS stack.<o:p></o:p></p>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <p class=3D"MsoNormal">Cheers,<o:p></o:p></p>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <p class=3D"MsoNormal">Andrei<o:p></o:p></p>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <div>
          <div
style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in=
 0in">
            <p class=3D"MsoNormal"><b><span
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Fro=
m:</span></b><span
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">
                Scott Fluhrer (sfluhrer)
                <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:sfluhre=
r=3D40cisco.com@dmarc.ietf.org">&lt;sfluhrer=3D40cisco.com@dmarc.ietf.org=
&gt;</a>
                <br>
                <b>Sent:</b> Monday, April 13, 2026 12:30 AM<br>
                <b>To:</b> Muhammad Usama Sardar
                <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:muhamma=
d_usama.sardar@tu-dresden.de">&lt;muhammad_usama.sardar@tu-dresden.de&gt;=
</a>; Kris
                Kwiatkowski <a class=3D"moz-txt-link-rfc2396E" href=3D"ma=
ilto:kris@amongbytes.com">&lt;kris@amongbytes.com&gt;</a>; <a class=3D"mo=
z-txt-link-abbreviated" href=3D"mailto:tls@ietf.org">tls@ietf.org</a><br>=

                <b>Subject:</b> [EXTERNAL] [TLS] Re: Working Group Last
                Call for Use of ML-DSA in TLS 1.3<o:p></o:p></span></p>
          </div>
        </div>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <div>
          <p class=3D"MsoNormal"><span
              style=3D"font-size:11.0pt;color:black">If you would prefer
              hybrid authentication, then I would suggest you publicly
              endorse either draft-reddy-tls-composite-mldsa (composite
              signatures; that is, the cert has both classical (e.g.
              RSA) and pq public keys (e.g. ML-DSA) and both are used to
              sign in a single logical signature operation) or
              draft-yusef-tls-pqt-dual-certs (the server sends both a
              classical certificate=C2=A0 and a pq certificate, and TLS
              generates two signatures using the two public keys)<o:p></o=
:p></span></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span
              style=3D"font-size:11.0pt;color:black"><o:p>=C2=A0</o:p></s=
pan></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span
              style=3D"font-size:11.0pt;color:black">Both are currently
              individual drafts; public support would be useful to make
              them working group items.<o:p></o:p></span></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span
              style=3D"font-size:11.0pt;color:black"><o:p>=C2=A0</o:p></s=
pan></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span
              style=3D"font-size:11.0pt;color:black">My opinion: composit=
e
              would be easier to for the working group; composite
              signature algorithms (and composite certificates) are very
              close to becoming an RFC
              (draft-ietf-lamps-pq-composite-sigs).=C2=A0 From the TLS
              perspective, all that would be needed in addition are code
              points (because it could just treat the signature
              algorithm in the composite draft as just another signature
              algorithm).<o:p></o:p></span></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span
style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:black"><o:p>=C2=
=A0</o:p></span></p>
        </div>
        <div class=3D"MsoNormal" align=3D"center" style=3D"text-align:cen=
ter">
          <hr size=3D"2" width=3D"98%" align=3D"center">
        </div>
        <div>
          <p class=3D"MsoNormal"><b><span
style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:black">From:</s=
pan></b><span
style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:black">=C2=A0Mu=
hammad
              Usama Sardar &lt;<a
                href=3D"mailto:muhammad_usama.sardar@tu-dresden.de"
                moz-do-not-send=3D"true" class=3D"moz-txt-link-freetext">=
muhammad_usama.sardar@tu-dresden.de</a>&gt;<br>
              <b>Sent:</b>=C2=A0Sunday, April 12, 2026 8:54 PM<br>
              <b>To:</b>=C2=A0Kris Kwiatkowski &lt;<a
                href=3D"mailto:kris@amongbytes.com" moz-do-not-send=3D"tr=
ue"
                class=3D"moz-txt-link-freetext">kris@amongbytes.com</a>&g=
t;;
              <a href=3D"mailto:tls@ietf.org" moz-do-not-send=3D"true"
                class=3D"moz-txt-link-freetext">tls@ietf.org</a> &lt;<a
                href=3D"mailto:tls@ietf.org" moz-do-not-send=3D"true"
                class=3D"moz-txt-link-freetext">tls@ietf.org</a>&gt;<br>
              <b>Subject:</b>=C2=A0[TLS] Re: Working Group Last Call for =
Use
              of ML-DSA in TLS 1.3 <o:p>
              </o:p></span></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span
style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:black"><o:p>=C2=
=A0</o:p></span></p>
        </div>
        <p
style=3D"mso-margin-top-alt:12.0pt;margin-right:0in;margin-bottom:12.0pt;=
margin-left:0in">
          TL;DR: My concern has been addressed and I am happy to step
          back from opposition to no opinion on this WGLC. I would have
          preferred standardizing hybrids.<o:p></o:p></p>
        <p
style=3D"mso-margin-top-alt:12.0pt;margin-right:0in;margin-bottom:12.0pt;=
margin-left:0in">
          <o:p>=C2=A0</o:p></p>
      </div>
      <br>
      <fieldset class=3D"moz-mime-attachment-header"></fieldset>
      <pre wrap=3D"" class=3D"moz-quote-pre">____________________________=
___________________
TLS mailing list -- <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:=
tls@ietf.org">tls@ietf.org</a>
To unsubscribe send an email to <a class=3D"moz-txt-link-abbreviated" hre=
f=3D"mailto:tls-leave@ietf.org">tls-leave@ietf.org</a>
</pre>
    </blockquote>
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