forked from mCaptcha/website
251 lines
13 KiB
HTML
251 lines
13 KiB
HTML
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<!doctype html>
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<html lang="en-US">
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<link rel="preload" as="font" href="/fonts/vendor/jost/jost-v4-latin-regular.woff2" type="font/woff2" crossorigin>
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<link rel="stylesheet" href="/main.4492eacff4110697cd6162326bce4ee59e92315bf9acc357594066968669326dc80b75b1a39e6cea81c4f8898bd1d294fcc657a9cb61baed14c7dee6f9e2b2d6.css" integrity="sha512-RJLqz/QRBpfNYWIya85O5Z6SMVv5rMNXWUBmloZpMm3IC3Wxo55s6oHE+ImL0dKU/MZXqcthuu0Ux97m+eKy1g==" crossorigin="anonymous">
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<meta name="bingbot" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1">
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<title>Say hello to mCaptcha - mCaptcha</title>
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<meta name="description" content="Introducing mCaptcha, a kickass CAPTCHA systems that gives (DDoS) attackers a run for their money. Oh and UX is great too!">
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<link rel="canonical" href="/blog/say-hello-to-mcaptcha/">
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<meta name="twitter:image" content="/blog/say-hello-to-mcaptcha/icon.png">
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<meta name="twitter:title" content="Say hello to mCaptcha">
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<meta name="twitter:description" content="Introducing mCaptcha, a kickass CAPTCHA systems that gives (DDoS) attackers a run for their money. Oh and UX is great too!">
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<meta name="twitter:site" content="@">
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<meta name="twitter:creator" content="@">
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<meta property="og:title" content="Say hello to mCaptcha">
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<meta property="og:description" content="Introducing mCaptcha, a kickass CAPTCHA systems that gives (DDoS) attackers a run for their money. Oh and UX is great too!">
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<meta property="og:type" content="article">
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<meta property="og:url" content="/blog/say-hello-to-mcaptcha/">
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<meta property="og:image" content="/blog/say-hello-to-mcaptcha/icon.png">
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<meta property="article:published_time" content="2021-05-26T00:00:00+00:00">
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<meta property="article:modified_time" content="2023-02-13T16:50:36+05:30">
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<meta property="og:site_name" content="mCaptcha">
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<meta property="article:publisher" content="https://www.facebook.com/">
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<meta property="article:author" content="https://www.facebook.com/">
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<meta property="og:locale" content="en_US">
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<script type="application/ld+json">
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{
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"@context": "http://schema.org",
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"@type": "BreadcrumbList",
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"itemListElement": [{
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"@type": "ListItem",
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"position": 1 ,
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"name": "Home",
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"item": "\/"
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},{
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"@type": "ListItem",
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"position": 2 ,
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"name": "Blogsay Hello to Mcaptcha",
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"item": "\/blogsay-hello-to-mcaptcha\/"
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}]
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}
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</script>
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<meta name="theme-color" content="#fff">
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<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
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<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
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<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
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<link rel="manifest" href="/site.webmanifest">
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</head>
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<body class="blog single">
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<div class="header-bar fixed-top"></div>
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<header class="navbar fixed-top navbar-expand-md navbar-light">
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<div class="container">
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<input class="menu-btn order-0" type="checkbox" id="menu-btn">
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<label class="menu-icon d-md-none" for="menu-btn"><span class="navicon"></span></label>
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<a class="navbar-brand order-1 order-md-0 me-auto" href="/">mCaptcha</a>
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<button id="mode" class="btn btn-link order-2 order-md-4" type="button" aria-label="Toggle mode">
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<span class="toggle-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-moon"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path></svg></span>
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<span class="toggle-light"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-sun"><circle cx="12" cy="12" r="5"></circle><line x1="12" y1="1" x2="12" y2="3"></line><line x1="12" y1="21" x2="12" y2="23"></line><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line><line x1="1" y1="12" x2="3" y2="12"></line><line x1="21" y1="12" x2="23" y2="12"></line><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line></svg></span>
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</button>
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<ul class="navbar-nav social-nav order-3 order-md-5">
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<li class="nav-item">
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<a class="nav-link" href="https://github.com/mCaptcha"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-github"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg><span class="ms-2 visually-hidden">GitHub</span></a>
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</li>
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</ul>
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<div class="collapse navbar-collapse order-4 order-md-1">
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<ul class="navbar-nav main-nav me-auto order-5 order-md-2"><li class="nav-item active">
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<a class="nav-link" href="/blog/">Blog</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="/community/">Community</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="/contact/">Contact</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="/about/">About</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="/docs/introduction/installing-captcha/">Docs</a>
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</li>
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</ul>
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<div class="break order-6 d-md-none"></div>
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<form class="navbar-form flex-grow-1 order-7 order-md-3">
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<input id="userinput" class="form-control is-search" type="search" placeholder="Search docs..." aria-label="Search docs..." autocomplete="off">
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<div id="suggestions" class="shadow bg-white rounded"></div>
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</form>
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</div>
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</div>
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</header>
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<div class="wrap container" role="document">
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<div class="content">
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<div class="row flex-xl-nowrap">
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<nav class="docs-toc d-none d-xl-block col-xl-3" aria-label="Secondary navigation">
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<div class="page-links">
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<h3>On this page</h3>
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<nav id="TableOfContents">
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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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</ul>
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</nav>
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</div>
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</nav>
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<main class="docs-content col-lg-11 col-xl-9 mx-xl-auto">
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<article>
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<div class="blog-header">
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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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</main>
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</div>
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</div>
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</div>
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<footer class="footer text-muted">
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<div class="container">
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<div class="row">
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<div class="col-lg-8 order-last order-lg-first">
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<ul class="list-inline">
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<li class="list-inline-item">Powered by <a href="https://gohugo.io/">Hugo</a>, and <a href="https://getdoks.org/">Doks</a></li>
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</ul>
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</div>
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<div class="col-lg-8 order-first order-lg-last text-lg-end">
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<ul class="list-inline">
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<li class="list-inline-item"><a href="/about/">About</a></li>
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<li class="list-inline-item"><a href="/donate">Donate</a></li>
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<li class="list-inline-item"><a href="/privacy-policy/">Privacy</a></li>
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<li class="list-inline-item"><a href="/security">Security</a></li>
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<li class="list-inline-item"><a href="https://stats.uptimerobot.com/GK7VLFJnBl">Status</a></li>
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<li class="list-inline-item"><a href="/thanks">Thanks</a></li>
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</ul>
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</div>
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</div>
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</div>
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</footer>
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<script src="/main.min.fc14a6a9dceb7093b6984e33583a45c79e3c960959d75df6b62753b4d1c63a97d25af2b0ca924ed12675f1de34f3fce9ec81668f2d3bee114b9b6357dd2e92cd.js" integrity="sha512-/BSmqdzrcJO2mE4zWDpFx548lglZ1132tidTtNHGOpfSWvKwypJO0SZ18d408/zp7IFmjy077hFLm2NX3S6SzQ==" crossorigin="anonymous" defer></script>
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</body>
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