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<li><a href="#participation-is-optional">Participation is optional</a></li>
<li><a href="#ensuring-anonymity">Ensuring anonymity</a></li>
<li><a href="#status">Status</a></li>
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<h1>Introducing mCaptcha net</h1>
<p><small>Posted October 19, 2023 by <a class="stretched-link position-relative" href="//localhost:1313/contributors/aravinth-manivannan/">Aravinth Manivannan</a>&nbsp;&hyphen;&nbsp;<strong>2&nbsp;min read</strong></small><p>
<p><small>Last Edited October 21, 2023</small><p>
</div>
<p class="lead"></p>
<p>mCaptcha uses a Proof-of-Work (PoW) based algorithm to offer
Denial-of-Service protection, because of <a href="https://www.w3.org/TR/turingtest/#proof-of-work">its excellent accessibility
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characteristics</a>. PoW
within mCaptcha is configuration &mdash; webmasters can configure
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<a href="/docs/terminology/difficulty-factor">difficulty factors</a> for their
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installations, which determines waiting time for visitors. But PoW can
become inaccessible if webmasters choose a very high difficulty factor.
So they have to maintain a balance which imposes sufficient load on DDoS
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attackers while also being accessible to common folk.</p>
<div class="alert alert-warning d-flex" role="alert">
<div class="flex-shrink-1 alert-icon">⭐</div>
<div class="w-100"> mCaptcha installation: integration of the mCaptcha widget to a service.</div>
</div>
<p>To help webmasters correctly configure difficult factors, we are
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building a feedback loop which would gather performance statistics from
voluntary mCaptcha installations and make them available to other
mCaptcha installations. The performance statistics can be used by all
mCaptcha instances to automatically optimize an installation. We are
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calling this the mCaptcha net.</p>
<h2 id="participation-is-optional">Participation is optional</h2>
<p>Participation in the mCaptcha net is disabled by default and is
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optional as it has privacy implications: it will reveal the
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existence of an mCaptcha instance.</p>
<p>The admins of mCaptcha instances can choose to upload truly anonymous
PoW performance statistics to a number of <a href="https://git.batsense.net/mCaptcha/survey">mCaptcha/survey</a> instances.
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The data uploaded is public and so is accessible to all mCaptcha
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instances.</p>
<p>We also offer opt-in controls at installation level:</p>
<figure>
<img class="img-fluid lazyload blur-up" data-sizes="auto" src="//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu1631596919080030605.png" data-srcset="//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu8665382681814203651.png 900w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu16960270070322992940.png 800w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu16731371422864467505.png 700w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu3312684040278026285.png 600w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu3805133206394116285.png 500w" width="759" height="745" alt="A screenshot of the &#39;add sitekey&#39; form on the mCaptcha dashboard with a checkbox for anonymously publishing performance statistics. It is not checked by default.">
<noscript><img class="img-fluid" sizes="100vw" srcset="//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu8665382681814203651.png 900w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu16960270070322992940.png 800w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu16731371422864467505.png 700w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu3312684040278026285.png 600w,//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in_hu3805133206394116285.png 500w" src="//localhost:1313/blog/introducing-mcaptcha-net/installation-level-opt-in.png" width="759" height="745" alt="A screenshot of the &#39;add sitekey&#39; form on the mCaptcha dashboard with a checkbox for anonymously publishing performance statistics. It is not checked by default."></noscript>
<figcaption class="figure-caption">Add sitekey form on the mCaptcha dashboard with a checkbox for anonymously publishing performance statistics. It is not checked by default.</figcaption>
</figure>
<h2 id="ensuring-anonymity">Ensuring anonymity</h2>
<p>mCaptcha doesn&rsquo;t fingerprint its users. Performance parameters include:</p>
<ol>
<li>Time taken to generate PoW</li>
<li>The difficulty factor for which the PoW was computed</li>
<li>Type of client library used.</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span><span style="color:#f1fa8c">&#34;time&#34;</span>:<span style="color:#bd93f9">14</span>,
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span><span style="color:#f1fa8c">&#34;difficulty_factor&#34;</span>:<span style="color:#bd93f9">50000</span>,
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span><span style="color:#f1fa8c">&#34;worker_type&#34;</span>:<span style="color:#f1fa8c">&#34;wasm&#34;</span>
</span></span></code></pre></div><p>This doesn&rsquo;t include the usual fingerprinting parameters like
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User-Agent, cookies, and IP address. Additionally, we use pseudo IDs
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at both mCaptcha/mCaptcha and mCaptcha/survey to avoid exposing installations.</p>
<figure>
<img class="img-fluid lazyload blur-up" data-sizes="auto" src="//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu3273415545955202374.png" data-srcset="//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu185061893514002747.png 900w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu5006962494299372084.png 800w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu2019269782775340852.png 700w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu17467133549504091124.png 600w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu15584172527816290803.png 500w" width="1842" height="1008" alt="A screenshot of a tmux window with logs of mCaptcha/mCaptcha and mCapctha/survey showing both of them talking to eachother">
<noscript><img class="img-fluid" sizes="100vw" srcset="//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu185061893514002747.png 900w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu5006962494299372084.png 800w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu2019269782775340852.png 700w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu17467133549504091124.png 600w,//localhost:1313/blog/introducing-mcaptcha-net/working-rpc_hu15584172527816290803.png 500w" src="//localhost:1313/blog/introducing-mcaptcha-net/working-rpc.png" width="1842" height="1008" alt="A screenshot of a tmux window with logs of mCaptcha/mCaptcha and mCapctha/survey showing both of them talking to eachother"></noscript>
<figcaption class="figure-caption">mCaptcha/mCaptcha uploading performance statistics to a mCaptcha/survey instance</figcaption>
</figure>
<h2 id="status">Status</h2>
<p>We now have performance statistics uploads to mCaptcha/survey instances
working. Pull request <a href="https://github.com/mCaptcha/mCaptcha/pull/92">mCaptcha/mCaptcha#92</a>
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added abilities to mCaptcha to upload statistics to mCaptcha/survey instances and
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<a href="https://git.batsense.net/mCaptcha/survey/pulls/17">mCaptcha/survey#40</a> enable survey to process the uploaded data. We will soon build a
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self-tuning algorithm within mCaptcha to use this data and optimize
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installations automatically.</p>
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&larr; Testing on screenreaders
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February, 2023: Monthly Report &rarr;
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