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no commits on the repositories and no monthly updates. But the project
is far from dead!</p><h2 id=python-bindings-to-mcaptcha-powhttpsgithubcommcaptchapow_sha256>Python bindings to <a href=https://github.com/mCaptcha/pow_sha256/>mCaptcha PoW</a></h2><p><a href=https://github.com/mCaptcha/pow_py>pow_py</a> contains bindings to
<a href=https://github.com/mCaptcha/pow_sha256>pow_sha256</a>, the
<a href=https://en.wikipedia.org/wiki/Proof_of_work>proof-of-work</a> library
that mCaptcha uses. For the uninitiated, the bindings allow for python
programs to automatically solve mCaptcha.</p><p>So if you are writing a script to do some chore on your favourite
website that is protected by mCaptcha, you can now solve the mCaptcha
automatically from within the program.</p><p>Here&rsquo;s an example:</p><div class=highlight><pre style=color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-python data-lang=python><span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 1</span><span style=color:#ff79c6>import</span> os
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 2</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 3</span><span style=color:#ff79c6>import</span> mcaptcha_pow_py
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 4</span><span style=color:#ff79c6>import</span> requests
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 5</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 6</span><span style=color:#6272a4># get the sitekey that is used in the mCaptcha protected form</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 7</span>SITEKEY <span style=color:#ff79c6>=</span> os<span style=color:#ff79c6>.</span>getenv(<span style=color:#f1fa8c>&#34;MCAPTCHA_CAPTCHA_SITEKEY&#34;</span>)
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 8</span><span style=color:#6272a4># the hostname of the mCaptcha instance that the form is using</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f"> 9</span>MCAPTCHA_HOST <span style=color:#ff79c6>=</span> os<span style=color:#ff79c6>.</span>getenv(<span style=color:#f1fa8c>&#34;MCAPTCHA_CAPTCHA_HOST&#34;</span>)
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">10</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">11</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">12</span>GET_CONFIG_ROUTE <span style=color:#ff79c6>=</span> f<span style=color:#f1fa8c>&#34;{MCAPTCHA_HOST}/api/v1/pow/config&#34;</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">13</span>VERIFY_POW_ROUTE <span style=color:#ff79c6>=</span> f<span style=color:#f1fa8c>&#34;{MCAPTCHA_HOST}/api/v1/pow/verify&#34;</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">14</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">15</span><span style=color:#ff79c6>def</span> <span style=color:#50fa7b>solve_captcha</span>():
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">16</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">17</span> <span style=color:#6272a4># get challenge configuration</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">18</span> key <span style=color:#ff79c6>=</span> {<span style=color:#f1fa8c>&#34;key&#34;</span>: sitekey}
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">19</span> challenge_config <span style=color:#ff79c6>=</span> requests<span style=color:#ff79c6>.</span>post(GET_CONFIG_ROUTE, json<span style=color:#ff79c6>=</span>key)
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">20</span> challenge_config <span style=color:#ff79c6>=</span> challenge_config<span style=color:#ff79c6>.</span>json()
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">21</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">22</span> <span style=color:#6272a4># extract configuration data</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">23</span> config <span style=color:#ff79c6>=</span> mcaptcha_pow_py<span style=color:#ff79c6>.</span>PoWConfig(challenge_config[<span style=color:#f1fa8c>&#34;salt&#34;</span>])
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">24</span> pow_string <span style=color:#ff79c6>=</span> challenge_config[<span style=color:#f1fa8c>&#34;string&#34;</span>]
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">25</span> pow_difficulty_factor <span style=color:#ff79c6>=</span> challenge_config[<span style=color:#f1fa8c>&#34;difficulty_factor&#34;</span>]
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">26</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">27</span> <span style=color:#6272a4># generate work</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">28</span> work <span style=color:#ff79c6>=</span> config<span style=color:#ff79c6>.</span>work(pow_string, pow_difficulty_factor)
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">29</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">30</span> <span style=color:#6272a4># verify PoW</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">31</span> proof <span style=color:#ff79c6>=</span> {
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">32</span> <span style=color:#f1fa8c>&#34;key&#34;</span>: SITEKEY,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">33</span> <span style=color:#f1fa8c>&#34;nonce&#34;</span>: work<span style=color:#ff79c6>.</span>nonce,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">34</span> <span style=color:#f1fa8c>&#34;result&#34;</span>: work<span style=color:#ff79c6>.</span>result,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">35</span> <span style=color:#f1fa8c>&#34;string&#34;</span>: challenge_config[<span style=color:#f1fa8c>&#34;string&#34;</span>],
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">36</span> }
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">37</span> resp <span style=color:#ff79c6>=</span> requests<span style=color:#ff79c6>.</span>post(VERIFY_POW_ROUTE, json<span style=color:#ff79c6>=</span>proof)
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">38</span> resp <span style=color:#ff79c6>=</span> resp<span style=color:#ff79c6>.</span>json()
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">39</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">40</span> <span style=color:#6272a4># extract verification token</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">41</span> token <span style=color:#ff79c6>=</span> resp[<span style=color:#f1fa8c>&#34;token&#34;</span>]
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">42</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">43</span> <span style=color:#ff79c6>return</span> token
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">44</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">45</span>
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">46</span>token <span style=color:#ff79c6>=</span> solve_captcha()
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">47</span>data <span style=color:#ff79c6>=</span> {
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">48</span> <span style=color:#f1fa8c>&#34;username&#34;</span>: <span style=color:#f1fa8c>&#34;me&#34;</span>,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">49</span> <span style=color:#f1fa8c>&#34;password&#34;</span>: <span style=color:#f1fa8c>&#34;superlongpassword&#34;</span>,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">50</span> <span style=color:#f1fa8c>&#34;confirm_password&#34;</span>: <span style=color:#f1fa8c>&#34;superlongpassword&#34;</span>,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">51</span> <span style=color:#f1fa8c>&#34;mcaptcha__token&#34;</span>: token,
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">52</span>}
<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">53</span>response <span style=color:#ff79c6>=</span> requests<span style=color:#ff79c6>.</span>post(<span style=color:#f1fa8c>&#34;/mCaptcha-protected-form&#34;</span>, data<span style=color:#ff79c6>=</span>data)
</code></pre></div><p>This could be missed for building DDoS bots(more on that
<a href=#measuring-ddos-protection-effectiveness>here</a>) but this could also be
used to make CAPTCHA solving automated within screen readers and other
accessibility devices!</p><h2 id=measuring-ddos-protection-effectiveness>Measuring DDoS protection effectiveness</h2><p>Proof-of-work has historically been a good method to achieve rate
limiting but how much attack can it, specifically mCaptcha&rsquo;s
implementation, withstand when compared to an unprotected endpoint? To
find out, we used the recently created Python bindings to the mCaptcha
PoW library, the excellent load testing tool,
<a href=https://locust.io>locust</a> and wrote
<a href=https://github.com/mCaptcha/dos>mCaptcha/dos</a>!</p><p><a href=https://vitap.ac.in>VIT AP</a> kindly permitted me, @realaravinth, to use their network
security lab for setting up a isolated, contained testing environment to
mount a DDoS attack on a <a href=https://github.com/mCaptcha/dos/tree/master/rust-server/demo-server>test
server</a>
instance.</p><p>The initial topology consisted of one mCaptcha instance, one DDoS demo
server, one locust node running in leader configuration and six locust
nodes running in follower configuration. I was authorised to use the
netsec lab for three days, which unfortunately wasn&rsquo;t enough to go
finish running the experiment. <a href=https://sibichakkaravarthy.github.io/>Dr. Sibi Chakkaravarthy
Sethuraman</a> has kindly offered to
arrange authorisation to use the netsec lab once again in July 2022,
during which I hope to finish running the experiment</p><p>Special thanks to <a href=http://ackr8.com/>ackr-8</a> and
<a href=https://github.com/alan2000alex>alan2000alex</a> for help with setting up
infrastructure of the experiment.</p><h2 id=refactor>Refactor</h2><p>mCaptcha underwent a major refactor during the month of May: We re-wrote
and cleaned up all database-related stuff for higher flexibility
and generally good architecture. This refactor lays the foundation
for implementing support for alternate database software
programs(we currently support PostgreSQL only).</p><h2 id=mcaptcha-is-now-on-the-fediverse>mCaptcha is now on the Fediverse</h2><p>We recently joined the Fediverse on a
<a href=https://docs.gotosocial.org/>GoToSocial</a> instance run by
@realaravinth. We&rsquo;ll soon be deleting our Twitter account in favour of
the Fediverse account.</p><p><strong>Fediverse account:</strong>
<a href=https://gts.batsense.net/@mcaptcha>@mCaptcha@batsense.net</a></p><h2 id=generic-hosting>Generic hosting</h2><p>I, @realaravinth, have been busy with <a href=https://forgeflux.org>ForgeFlux</a>
and <a href=https://hostea.org>Hostea</a> &mdash; both of which are <a href=https://en.wikipedia.org/wiki/Forge_(software)>software
forge</a> related and so
when usable, will mostly improve the Free Software ecosystem. Hostea is
a project that aims to create a libre software development ecosystem and
provide managed hosting for the same. The project is <a href=https://forum.hostea.org/t/a-guide-to-hostea-governance/57>built by a
horizontal community</a>, which allows for multiple service providers who
adhere to the Hostea policies to operate
under the Hostea umbrella &mdash; essentially allowing for the creation of
smaller, highly localised cooperatives.</p><p>Cooperatives are interesting, and we believe that mCaptcha, too, can
benefit from such an architecture as it will prevent any one party from
single-handedly sabotaging the project. The experience gained from
Hostea will be reused in providing managed hosting for mCaptcha.</p><p>By the end of this year, mCaptcha will reorganise into a horizontal
community and adopt <a href=https://en.wikipedia.org/wiki/Radical_transparency#Radical_corporate_transparency>radical transparency</a> to improve trust and
reliability of the project</p><blockquote><p>P.S: I, realaravinth, would do it sooner but I&rsquo;m a little busy right
now, so if someone is interested to help out do reach out and so that
we could do it sooner!</p></blockquote><p>In context of mCaptcha, radical transparency will include all decisions
publicly made, funding and expenses publicly documented, and all
collaborations, too, publicly documented. This of course doesn&rsquo;t imply
that private, personally identifiable information(addresses and phone
numbers, for instance) will be publicly disclosed. Such information will
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