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    Last updated: <time datetime="2022-09-30">Sep 30, 2022</time>


 | <a href="/docs">See all Documentation</a>
</p>





<h1 id="what-s-lencr-org">What&rsquo;s <code>lencr.org</code>?</h1>
<p><code>lencr.org</code> is a domain name owned by Let&rsquo;s Encrypt. We use it to host data
that is referenced inside the certificates we issue.</p>
<h1 id="why-is-my-computer-fetching-this-data-is-it-malicious">Why is my computer fetching this data? Is it malicious?</h1>
<p>No, the data on <code>lencr.org</code> is never malicious. When a device connects to
<code>lencr.org</code>, it&rsquo;s because client software on that device (like a web browser or
an app) connected to another site, saw a Let&rsquo;s Encrypt certificate, and is
trying to verify that it&rsquo;s valid. This is routine for many clients.</p>
<p>We can&rsquo;t speak to whether the <em>other site</em> being connected to is malicious. If
you&rsquo;re investigating network activity that seems unusual, then you may want to
focus on the connection that started just before the connection to <code>lencr.org</code>.</p>
<p>The pattern of clients&rsquo; connections to <code>lencr.org</code> might look unusual or
intermittent. Clients might never retrieve this data; only retrieve subsets of
it; or &ldquo;cache&rdquo; some data for efficiency, so they&rsquo;ll only access it sometimes
(the first time they need it, and when the data may have expired).</p>
<h1 id="what-exactly-is-this-data-for">What exactly is this data for?</h1>
<p>When client software (like a web browser or an app) connects to a site, and that
site presents a certificate, the client should verify that the certificate is
authentic and valid. This data helps clients do that in several ways.</p>
<ul>
<li>
<p>Under <code>o.lencr.org</code>, we provide Online Certificate Status Protocol (OCSP) data.
A client may use this data to confirm whether an individual unexpired
certificate that we issued is still valid, or was revoked. (This is only for
&ldquo;end-entity&rdquo; or &ldquo;leaf&rdquo; certificates, which we&rsquo;ve issued to subscribers from one
of our intermediate certificates.)</p>
</li>
<li>
<p>Under <code>c.lencr.org</code>, we provide Certificate Revocation Lists (CRLs) listing
all the unexpired certificates that we issued and later revoked.</p>
</li>
<li>
<p>Under <code>i.lencr.org</code>, we provide copies of our intermediate &ldquo;issuer&rdquo;
certificates, which are either signed by one of our root certificates or
&ldquo;cross-signed&rdquo; by another Certificate Authority (CA). A client may use this
data to confirm the &ldquo;chain of trust&rdquo; from the end-entity certificate it&rsquo;s
verifying, via one or more intermediate steps, to a root CA certificate that it
recognizes and trusts.</p>
</li>
</ul>
<h1 id="why-are-connections-to-o-lencr-org-over-insecure-http">Why are connections to <code>o.lencr.org</code> over insecure HTTP?</h1>
<p>OCSP responses are always served over HTTP. If they were served over HTTPS,
there would be an &ldquo;infinite loop&rdquo; problem: in order to verify the OCSP server&rsquo;s
certificate, the client would have to use OCSP.</p>
<p>The OCSP response itself is timestamped and cryptographically signed, so the
anti-tampering properties of TLS aren&rsquo;t needed in this case.</p>
<h1 id="why-lencr-org">Why &ldquo;<code>lencr.org</code>&rdquo;?</h1>
<p>We used to use longer URLs like <code>http://ocsp.int-x3.letsencrypt.org/</code>. However,
when we issued our <a href="https://letsencrypt.org/2020/09/17/new-root-and-intermediates.html">new root and intermediate certificates</a>, we wanted to
make them as small as possible. Every HTTPS connection on the web (billions per
day) has to send a copy of a certificate, so every byte matters. We chose
<code>lencr.org</code> because of its similarity with our name: <strong>L</strong>et&rsquo;s <strong>ENCR</strong>ypt. We
pronounce it much like the fictional region of <a href="https://wiki.lspace.org/Lancre">Lancre</a> in Terry Pratchett&rsquo;s
<em>Discworld</em> novels.</p>
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