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<!DOCTYPE html>
<html>
<head>
<title>Mathias Ertl: Digital identity</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<link href="lib/bootstrap/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="page-header">
<h1>Mathias Ertl: Digital identity</h1>
</div>
<p>
This page lists usernames of various websites as well as signatures of
various cryptographic keys.
</p>
<p class="alert alert-danger">
If you have reason to believe someone is trying to impersonate me,
please contact me right away.
</p>
<p>
<strong>Verify this page:</strong> View it in the
<a href="http://webcache.googleusercontent.com/search?q=cache:https://id.er.tl"> Google cache</a> or
the <a href="http://web.archive.org/web/*/https://id.er.tl">Wayback machine</a>. The source code is
<a href="https://github.com/mathiasertl/id/">on GitHub</a>. A detached GnuPG signature of this
document is <a href="/index.html.sig">available here</a>.
</p>
<h3>Accounts on websites</h3>
<p>
Any account on any website that is not listed here (or <a href="#deprecated">under
deprecated</a>), should be considered an impersonation - please contact me right away!
</p>
<ul>
<li>Twitter (a.k.a. X): <a href="https://twitter.com/mathiasertl">@mathiasertl</a></li>
<li>Bluesky: <a href="https://bsky.app/profile/mathiasertl.bsky.social">@mathiasertl.bsky.social</a></li>
<li>Instagram: <a href="https://www.instagram.com/matiertl/">matiertl</a></li>
<li>GitHub: <a href="https://github.com/mathiasertl">mathiasertl</a></li>
</ul>
<div class="alert alert-warning">
<strong>Facebook:</strong> No, I don't have Facebook. If you find an account that
looks like it belongs to me it is most certainly an impersonation!
</div>
Some websites I barely use. Don't expect too much activity here, but feel free to add me to
your Network:
<ul>
<li>LinkedIn: <a href="https://www.linkedin.com/pub/mathias-ertl/45/a91/a76">Mathias Ertl</a></li>
<li>Xing: <a href="https://www.xing.com/profiles/Mathias_Ertl">Mathias Ertl</a></li>
</ul>
<a id="ssh"></a><h3>SSH keys</h3>
<p>SSH keys used to connect to remote machines. I use unique keys for every host.</p>
<ul>
<li>mati@tpx1 (Primary SSH key, since 2023-01-31):
<a href="files/ssh/mati_tpx1/id_ed25519.pub">id_ed25519.pub</a>,
<a href="files/ssh/mati_tpx1/id_rsa.pub">id_rsa.pub</a>
</li>
</ul>
<a id="gnupg"></a><h3>GnuPG</h3>
<p>
My primary GPG key (<a
href="/files/gpg/0xE8172F2940EA9F709842290870BD9664FA3947CD.pub">download</a>)
is used for signing commits on GitHub:
</p>
<ul>
<li>Fingerprint: <code>E817 2F29 40EA 9F70 9842 2908 70BD 9664 FA39 47CD</code></li>
</ul>
<p>This key is renewed every two years.</p>
<p>
A second GnuPG key (<a
href="/0x73D8904C7230B6BDACFB412D0B36C59BD792B1D9.pub">download</a>):
is used on some remote hosts. Since its more likely
that the host is compromised, less trust should be given to this (and
it is hence only valid for at most a year).
</p>
<ul>
<li>Fingerprint: <code>73D8 904C 7230 B6BD ACFB 412D 0B36 C59B D792 B1D9</code></li>
</ul>
<a id="deprecated"></a><h3>Deprecated</h3>
<p>A short, certainly incomplete list of stuff I don't use anymore:</p>
<ul>
<li>SSH keys - <strong>remove these keys</strong> if you find them on an SSH host:
<ul>
<li>mertl@ubimet.com (SSH key used at Ubimet, from 2021-05-01 until 2023-08-05):
<a href="files/ssh/mertl_ubimet.com/id_ed25519.pub">id_ed25519.pub</a>,
<a href="files/ssh/mertl_ubimet.com/id_rsa.pub">id_rsa.pub</a>
</li>
</ul>
</li>
<li>GitHub: <a href="https://github.com/matigit">matigit</a> (until 2013-12-22)</li>
<li>Google+: <a href="https://plus.google.com/u/0/114826228375476404491/">Mathias Ertl</a></li>
<li>Flattr: <a href="https://flattr.com/profile/mathiasertl">mathiasertl</a></li>
<li>GnuPG: <code>1D503977</code> (until 2013-12-01) (<a href="/0x1D503977.pub">download</a>)</li>
<li>OTR via Jabber/XMPP (just unusable):
<ul>
<li><code>17708AFD A10AE972 F8057908 DF5FE9C2 11F3D174</code></li>
<li><code>D79314F0 37341CAF A4DC7C9D 89838CF1 B9DA55CC</code></li>
<li><code>3C753FC6 E881C943 14B6FC20 C0E979B9 2CF9D596</code></li><!-- mcabber -->
</ul>
</li>
<li>S/MIME certificates:
<ul>
<li>from 2015-12-25 until 2016-09-18 (<a
href="/files/MathiasErtl2015.pem">download</a>):
<ul>
<li>sha1: <code>E6:31:0A:99:12:E4:69:EE:B0:65:35:92:76:8F:29:A2:D7:62:AE:21</code></li>
<li>sha256:
<code>AA:BE:8D:27:84:1E:4F:77:6A:58:F2:68:55:5A:A5:05:91:39:58:4A:9D:BB:B9:06:E4:73:C5:75:92:A3:03:27</code></li>
</ul>
</li>
<li>from 2013-12-25 until 2015-12-25 (<a
href="/files/MathiasErtl2013.pem">download</a>):
<ul>
<li>sha1: <code>3C:D4:BE:A7:BB:ED:E9:41:26:55:D0:C8:0B:26:74:4C:6E:62:1D:09</code></li>
<li>sha256: <code>95:85:BD:54:E7:D6:11:EA:A6:86:6A:22:FC:14:AD:0C:06:CA:AD:B7:55:07:08:F2:A4:FD:05:7B:2B:30:C3:14</code></li>
</ul>
</li>
</ul>
</li>
</ul>
<a id="about"></a><h3>About this homepage</h3>
<p>The source for this homepage is <a href="https://github.com/mathiasertl/id">managed on GitHub</a>.</p>
</div><!--container-->
</body>
</html>
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