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<li><a href="#participation-is-optional">Participation is optional</a></li>
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<li><a href="#ensuring-anonymity">Ensuring anonymity</a></li>
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<li><a href="#status">Status</a></li>
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<h1>Introducing mCaptcha net</h1>
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<p><small>Posted October 19, 2023 by <a class="stretched-link position-relative" href="/contributors/aravinth-manivannan/">Aravinth Manivannan</a> ‐ <strong>2 min read</strong></small><p>
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<p><small>Last Edited October 21, 2023</small><p>
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</div>
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<p class="lead"></p>
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<p>mCaptcha uses a Proof-of-Work (PoW) based algorithm to offer
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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
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within mCaptcha is configuration — 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
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become inaccessible if webmasters choose a very high difficulty factor.
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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>
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<div class="alert alert-warning d-flex" role="alert">
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<div class="flex-shrink-1 alert-icon">⭐</div>
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<div class="w-100"> mCaptcha installation: integration of the mCaptcha widget to a service.</div>
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</div>
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<p>To help webmasters correctly configure difficult factors, we are
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building a feedback loop which would gather performance statistics from
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voluntary mCaptcha installations and make them available to other
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mCaptcha installations. The performance statistics can be used by all
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mCaptcha instances to automatically optimize an installation. We are
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calling this the mCaptcha net.</p>
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<h2 id="participation-is-optional">Participation is optional</h2>
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<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>
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<p>The admins of mCaptcha instances can choose to upload truly anonymous
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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>
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<p>We also offer opt-in controls at installation level:</p>
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<figure>
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<img class="img-fluid lazyload blur-up" data-sizes="auto" src="/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_20x0_resize_box_3.png" data-srcset="/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_900x0_resize_box_3.png 900w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_800x0_resize_box_3.png 800w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_700x0_resize_box_3.png 700w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_600x0_resize_box_3.png 600w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_500x0_resize_box_3.png 500w" width="759" height="745" alt="A screenshot of the 'add sitekey' form on the mCaptcha dashboard with a checkbox for anonymously publishing performance statistics. It is not checked by default.">
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<noscript><img class="img-fluid" sizes="100vw" srcset="/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_900x0_resize_box_3.png 900w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_800x0_resize_box_3.png 800w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_700x0_resize_box_3.png 700w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_600x0_resize_box_3.png 600w,/blog/introducing-mcaptcha-net/installation-level-opt-in_huf73c7a9ce7ec84ce553fffad281cd7ba_53366_500x0_resize_box_3.png 500w" src="/blog/introducing-mcaptcha-net/installation-level-opt-in.png" width="759" height="745" alt="A screenshot of the 'add sitekey' form on the mCaptcha dashboard with a checkbox for anonymously publishing performance statistics. It is not checked by default."></noscript>
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<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>
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</figure>
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<h2 id="ensuring-anonymity">Ensuring anonymity</h2>
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<p>mCaptcha doesn’t fingerprint its users. Performance parameters include:</p>
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<ol>
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<li>Time taken to generate PoW</li>
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<li>The difficulty factor for which the PoW was computed</li>
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<li>Type of client library used.</li>
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</ol>
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<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">"time"</span>:<span style="color:#bd93f9">14</span>,
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</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">"difficulty_factor"</span>:<span style="color:#bd93f9">50000</span>,
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</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">"worker_type"</span>:<span style="color:#f1fa8c">"wasm"</span>
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</span></span></code></pre></div><p>This doesn’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>
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<figure>
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<img class="img-fluid lazyload blur-up" data-sizes="auto" src="/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_20x0_resize_box_3.png" data-srcset="/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_900x0_resize_box_3.png 900w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_800x0_resize_box_3.png 800w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_700x0_resize_box_3.png 700w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_600x0_resize_box_3.png 600w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_500x0_resize_box_3.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">
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<noscript><img class="img-fluid" sizes="100vw" srcset="/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_900x0_resize_box_3.png 900w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_800x0_resize_box_3.png 800w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_700x0_resize_box_3.png 700w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_600x0_resize_box_3.png 600w,/blog/introducing-mcaptcha-net/working-rpc_huca78e586ec60552618ec5b6b3f0d9a9a_322974_500x0_resize_box_3.png 500w" src="/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>
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<figcaption class="figure-caption">mCaptcha/mCaptcha uploading performance statistics to a mCaptcha/survey instance</figcaption>
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</figure>
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<h2 id="status">Status</h2>
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<p>We now have performance statistics uploads to mCaptcha/survey instances
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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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</html>
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