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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>Anonymity Online: Tor</title>
<meta name="description" content="Anonymity Online: Tor">
<meta name="author" content="Vasilis Ververis">
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<body>
<div class="reveal">
<div class="slides">
<section>
<section data-background="cifra-te-ou-devoram-images-session00/cifrate.png"
data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session00/cifrate.png"
data-background-size="100vh"
style="background-color:rgba(0,0,0,0.6);">
Cifra-te ou Devoram-te <br>
0xCFD0 <br>
# 01010110010101011 <br>
Introduction to Online Privacy and Anonymity (Part 2)
</section>
</section>
<section>
<section data-background="cifra-te-ou-devoram-images-session02/onion-net.png" data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/onion-net.png" style="background-color:rgba(0,0,0,0.8);" data-background-size="100vh">
The Tor project
<p>
<small>
Mission: be the global resource for technology,
advocacy, research and education in the ongoing pursuit
of freedom of speech, privacy rights online, and
censorship circumvention.
</small>
</p>
</section>
<section>
What is Tor?
<ul>
<li>Online anonymity</li>
<ul>
<li>FL/OSS</li>
<li>Open (volunteer based) network</li>
</ul>
<li>Community: researchers, developers, users, relay
operators, [...]</li>
<li>U.S. 501(c)(3) non-profit organization</li>
</ul>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/userstats-relay-country-all-2018-03-24-2018-10-22-off.png" data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/userstats-relay-country-all-2018-03-24-2018-10-22-off.png" style="background-color:rgba(0,0,0,0.8);" data-background-size="100vh">
Estimated ~2,000,000+ Tor users (daily)
</section>
</section>
<section>
<section>
<h3>Understanding your thread model:</h3>
<p>
I use encryption (HTTPS, ...) my ISP cannot see my traffic!
Maybe it cannot see your traffic (in cleartext), *but*
it tracks:
</p>
<ul>
<li>Websites visited</li>
<li>Locations logs</li>
<li>IP address logs</li>
<li>..archived for x time: Data retention</li>
</ul>
</section>
<section>
VPN / Proxy Providers
<img class="plain" data-src="cifra-te-ou-devoram-images-session02/1hop-proxy.png">
<!-- Some commercial proxy providers -->
</section>
<section>
VPN / Proxy Providers: (often) single point of failure
<img class="plain" data-src="cifra-te-ou-devoram-images-session02/1hop-fail.png">
<!-- Some commercial proxy providers -->
</section>
<section>
VPN / Proxy Providers: (often) single point of bypass
<img class="plain" data-src="cifra-te-ou-devoram-images-session02/1hop-bypass.png">
<!-- Timing analysis bridges all connections through
relay ⇒ An attractive fat target -->
</section>
<section data-background="cifra-te-ou-devoram-images-session02/Powered_Purple.svg" data-background-size="50vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/Powered_Purple.svg" style="background-color:rgba(0,0,0,0.8);" data-background-size="50vh">
<h3>Anonymity: different interests for different user groups</h3>
</section>
<section>
<h3>Anonymity: different interests for different user groups</h3>
<img style="background:orange;" class="plain" data-src="cifra-te-ou-devoram-images-session02/anon-citizens.png">
</section>
<section>
<h3>Anonymity: different interests for different user groups</h3>
<img style="background:orange;" class="plain" data-src="cifra-te-ou-devoram-images-session02/anon-business.png">
</section>
<section>
<h3>Anonymity: different interests for different user groups</h3>
<img style="background:orange;"class="plain" data-src="cifra-te-ou-devoram-images-session02/anon-gov.png">
</section>
<section>
<h3>Anonymity: different interests for different user groups</h3>
<img style="background:orange;"class="plain" data-src="cifra-te-ou-devoram-images-session02/anon-activists.png">
</section>
</section>
<section>
<section data-background="cifra-te-ou-devoram-images-session02/Onion_Color.svg" data-background-size="50vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/Onion_Color.svg" style="background-color:rgba(0,0,0,0.8);" data-background-size="50vh">
<h2>How Tor works<h2>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/how-tor-works.svg" data-background-color="#ffffff" data-background-size="60vh">
<span class="attribution"><small><small>Source: <a href="https://trac.torproject.org/projects/tor/wiki/doc/tor-teachers">Tor teachers</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/htw1.svg" data-background-color="#ffffff" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://svn.torproject.org/svn/website/trunk/images/htw1.svg">Tor website</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/htw2.svg" data-background-color="#ffffff" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://svn.torproject.org/svn/website/trunk/images/htw2.svg">Tor website</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/htw3.svg" data-background-color="#ffffff" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://svn.torproject.org/svn/website/trunk/images/htw3.svg">Tor website</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/bandwidth-2009-07-24-2018-10-22.png" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://metrics.torproject.org/bandwidth.html?start=2009-07-24&end=2018-10-22">Tor metrics</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/bandwidth-flags-2009-07-24-2018-10-22.png" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://metrics.torproject.org/bandwidth-flags.html?start=2009-07-24&end=2018-10-22">Tor metrics</a></small></small></span>
</section>
<section>
<p>Tor's safety comes from diversity</p>
<ul>
<li>Diversity of relays</li>
<li>Diversity of users</li>
</ul>
</section>
<section>
<p>Transparency for Tor is key</p>
<ul>
<li>FL/OSS</li>
<li>Public design documents and specifications</li>
</ul>
</section>
<section>
<p>But what about the bad people?</p>
<ul>
<li>(remember) the millions of daily users</li>
<li>Still a two-edged sword?</li>
<li>Good people need Tor much more than bad people need it</li>
</ul>
</section>
<section>
<p>Onion services</p>
<ul>
<li>Self authenticated</li>
<li>End-to-end encrypted</li>
<li>Built-in NAT punching</li>
<li>Limit surface area</li>
<li>No need to “exit” from Tor</li>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/hidserv-rend-relayed-cells-2010-08-19-2018-10-22.png" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://metrics.torproject.org/hidserv-rend-relayed-cells.png?start=2010-08-19&end=2018-10-22">Tor metrics</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/3percent-onions.png" data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/3percent-onions.png" style="background-color:rgba(0,0,0,0.8);" data-background-size="100vh">
<ul>
<li>About 3% of Tor's traffic has to do with onion
services at all</li>
<li>Onion services are still in the "neat toy" stage</li>
<li>Terbium labs (and others) found ~7000 useful onion sites</li>
</ul>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/deepweb-iceberg.png" data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/facebook-onion.png" data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/other-onion-services.png" data-background-size="100vh" data-background-color="#808080">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/securedrop.png" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://en.wikipedia.org/wiki/File:Screenshot_from_SecureDrop_Source_view.png">ParkerHiggins</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/ricochet.png" data-background-size="100vh">
</section>
<section data-background="cifra-te-ou-devoram-images-session02/onionshare-server.png" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://github.com/micahflee/onionshare/blob/master/screenshots/server.png">OnionShare git repository</a></small></small></span>
</section>
<section data-background="cifra-te-ou-devoram-images-session02/onionshare-client.png" data-background-size="100vh">
<span class="attribution"><small><small>Source: <a href="https://github.com/micahflee/onionshare/blob/master/screenshots/appdata-client.png">OnionShare git repository</a></small></small></span>
</section>
<section>
<h2>How can you help Tor?</h2>
<ul>
<li>Run a relay (or a bridge)</li>
<li>Teach your friends about Tor, and privacy in general</li>
<li>Help fix -- and fix -- bugs</li>
<li>Work on open research problems (petsymposium.org)</li>
</ul>
</section>
<section>
Protect your privacy
<img class="plain" src="cifra-te-ou-devoram-images-session02/Browser_Horizontal_Color.svg"/>
<small>
<a href="https://www.torproject.org/download/download-easy.html">https://www.torproject.org/download/download-easy.html/</a>
<small>
</section>
</section>
</div>
</div>
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