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<h3>On this page</h3>
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<ul>
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<li><a href="#how-does-it-work">How does it work?</a></li>
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<li><a href="#okay-but-what-about-bad-actors">Okay, but what about bad actors?</a></li>
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<li><a href="#why-use-mcaptcha">Why use mCaptcha?</a></li>
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<li><a href="#how-to-migrate">How to migrate?</a></li>
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<li><a href="#our-philosophy">Our Philosophy</a></li>
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<li><a href="#resources">Resources</a></li>
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<h1>Say hello to mCaptcha</h1>
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<p><small>Posted May 26, 2021 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 February 13, 2023</small><p>
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</div>
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<p class="lead">We are mCaptcha. We build kickass CAPTCHA systems that give (DDoS) attackers a run for their money. And we do all of this without tracking your users. Oh and did I mention our UX is great?</p>
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<p>At mCaptcha, we believe in digital freedom and privacy and so we built a
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<a href="https://en.wikipedia.org/wiki/Proof_of_work">proof-of-work</a> based
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CAPTCHA system that doesn’t track. Seriously, no tracking. But that
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isn’t the killer feature, our system doesn’t require the user to
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pick cars or ID sidewalks — our system does it’s thing(usually
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at the click of a button) and gets out of the way.</p>
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<h2 id="how-does-it-work">How does it work?</h2>
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<p>mCaptcha uses SHA256 based proof-of-work(PoW) to rate limit users.</p>
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<p>When a user wants to do something on an mCaptcha-protected website,</p>
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<ol>
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<li>
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<p>they will have to generate proof-of-work(a bunch of math that will
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takes time to compute) and submit it to mCaptcha.</p>
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</li>
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<li>
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<p>We’ll validate the proof:</p>
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</li>
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</ol>
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<ul>
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<li>if validation is unsuccessful, they will be prevented from accessing
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the destination website</li>
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<li>if validation is successful, read on,</li>
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</ul>
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<ol start="3">
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<li>
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<p>They will be issued a token that should be submit along with the
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request/form to the destination website.</p>
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</li>
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<li>
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<p>The destination website validates the submitted token with
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mCaptcha before processing the request.</p>
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</li>
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</ol>
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<p>The whole process is automated from the user’s point of view. All they
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have to do is click on a button to initiate the process.</p>
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<h2 id="okay-but-what-about-bad-actors">Okay, but what about bad actors?</h2>
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<p>mCaptcha makes interacting with websites (computationally)expensive for
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the user. A well-behaving user will experience a slight delay(no delay
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when under moderate load to 2-3 seconds when under attack; PoW difficulty is
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variable) but if someone wants to hammer your site, they will have to do
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more work to send requests than your server you will have to do to respond
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to their request.</p>
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<h2 id="why-use-mcaptcha">Why use mCaptcha?</h2>
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<ul>
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<li><strong>Free software, privacy focused</strong></li>
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<li><strong>Seamless</strong> UX — No more annoying CAPTCHAs!</li>
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<li><strong>IP address independent:</strong> your users are behind a NAT? We got you covered!</li>
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<li><strong>Automatic bot throttling</strong></li>
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<li><strong>Resistant to replay attacks:</strong> proof-of-work configurations have short lifetimes(30s) and can be used only once. If a user submits a PoW to an already used configuration or an expired one, their proof will be rejected.</li>
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</ul>
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<h2 id="how-to-migrate">How to migrate?</h2>
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<p>Our client libraries are mostly compatible with reCAPTCHA and hCaptcha.
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A detailed guide will be published soon.</p>
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<h2 id="our-philosophy">Our Philosophy</h2>
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<p>Man has has come so far only because our ancestors chose to
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share their knowledge with others. If everything was labeled
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intellectual property, we might still be stuck in Stone Age. The idea of
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intellectual property is alien to us. For this reason, all of our source
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code is freely available(both as in freedom and beers) at <a href="https://github.com/mCaptcha/">our
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GitHub</a>.</p>
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<h2 id="resources">Resources</h2>
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<ul>
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<li><a href="https://github.com/mCaptcha/guard">guard</a> - mCaptcha backend <code>AGPL</code></li>
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<li><a href="https://github.com/mCaptcha/browser">frontend library</a> - mCaptcha frontend library. <code>MIT/APACHE</code></li>
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</ul>
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</article>
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<div class="docs-navigation d-flex justify-content-between">
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<a href="/blog/pow-performance/">
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<div class="card my-1">
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<div class="card-body py-2">
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← PoW performance
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</div>
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</div>
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</a>
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</div>
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<p class="edit-page"><a href="https://github.com/mCaptcha/website/blob/master/content/blog/say-hello-to-mcaptcha/index.md"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-edit-2"><path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path></svg>Edit this page on GitHub</a></p>
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