<!--
- Copyright 2016 Soren Stoutner <soren@stoutner.com>.
+ Copyright © 2016-2017 Soren Stoutner <soren@stoutner.com>.
This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
along with Privacy Browser. If not, see <http://www.gnu.org/licenses/>. -->
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-<body>
-<h3>Masking IP Addresses</h3>
-
-<p>Although it isn't a perfect science, IP addresses can be turned into physical addresses with increasing accuracy.
- There are <a href="https://www.whatismyip.com/">public databases</a> that show which ISP owns which IP address with a
- good sense of which region they use it in. There are private databases with more accurate information. And, of course,
- the ISP knows the exact service address of each IP address.</p>
-
-<p>VPN services can mask a device's IP address from a web server. When a VPN service is engaged, all traffic is encrypted and routed
- through the VPN server. The web server only sees the IP address of the VPN server. This is sufficient for maintaining anonymity
- from web server operators and advertisers, but it isn't sufficient for maintaining anonymity from oppressive regimes which might
- be able to lean on VPN operators to turn over their logs showing the original IP addresses. Those looking for safety from such
- regimes or desiring to blow the whistle on government agencies need something more.</p>
-
-<p>The Tor (The Onion Router) network was designed for just such purposes. It bounces encrypted web traffic through at least three independent servers
- that volunteer bandwidth to the project. None of the servers have enough information to identify both the IP address of the original computer
- and the final destination. Therefore, any government agency wanting to access the information would have to compromise all the machines in the
- link, which are dispersed over the globe. This doesn't provide perfect privacy, but it gets pretty close.</p>
-
-<p>The Tor project has an app for Android called Orbot, which is available on <a href="https://f-droid.org/repository/browse/?fdfilter=orbot&fdid=org.torproject.android">F-Droid</a>
- and everywhere else Privacy Browser is distributed. Orbot can operate in three modes.</p>
-
-<ul>
- <li><strong>Proxy mode</strong> Apps have to request to proxy their traffic through Orbot, meaning that each app developer has to add code to
- their project to make it work.</li>
- <li><strong>Transparent proxy mode</strong> Orbot intercepts traffic from other apps as it heads out onto the network and redirects it to the
- Tor network. Apps do not need to be modified by their developer to work with transparent proxy mode, but it does require that Orbot have
- root access on the device.</li>
- <li><strong>VPN mode</strong> Orbot registers itself as a VPN using Android's builtin VPN interface. Apps do not need to be modified by the
- developer to work with Orbot in VPN mode and root is not required.</li>
-</ul>
-
-<p>Currently, Privacy Browser works with Orbot in transparent proxy and VPN modes. Support for the standard proxy mode will be added in a
- <a href="https://redmine.stoutner.com/issues/26">future release</a>.</p>
-
-<p>Because traffic is being routed through several Tor nodes, using Tor is often much slower than going straight to the internet.</p>
-</body>
+ <head>
+ <meta charset="UTF-8">
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+ <!-- We have to make an image into its own block to center it. -->
+ <style>
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+ <body>
+ <h3>Tor and Its Limits</h3>
+
+ <p>There are two general categories of bad actors that want to infringe on the privacy of the web: malicious governments with access to ISPs (Internet Service Providers) and mega corporations that run social and advertising networks.
+ TOR (The Onion Router) is useful in protecting privacy from malicious governments (which spy on traffic in transit) but not from mega corporations (which embed malicious code on web servers).</p>
+
+
+ <h3>Malicious Governments</h3>
+
+ <p>Malicious governments often spy on their citizens to punish dissent or human rights activity. They commonly either
+ operate the local ISPs or they can force them to disclose information showing every IP address that is visited
+ by each user. Tor is designed to defeat this infringement of privacy by encrypting the traffic
+ from a user’s device and routing it through three separate servers on the internet before sending it on to the final destination.
+ This means that no individual ISP, server, or website, can know both the <a href="https://ipleak.net">IP address the user’s device</a>
+ and the IP address of the final web server. Malicious governments and the ISPs they control cannot tell which
+ web servers a user is accessing, although they can tell that the user is using Tor. In some parts of
+ the world, using Tor could be construed as an evidence of illegal behavior (“if you didn’t have anything
+ to hide you wouldn’t be encrypting your traffic”) and users could be punished because governments
+ assume they are doing something that is prohibited. Thus, Tor can be helpful, but isn’t a panacea.</p>
+
+
+ <h3>Mega Corporations</h3>
+
+ <p>When a user connects to a web server, the web server can see the user’s IP address. Although it isn’t a perfect science,
+ IP addresses can be turned into physical addresses with a <a href="https://www.whatismyip.com/">fair amount of accuracy</a>.
+ Small web servers typically rely on IP addresses to identify the location of the users visiting their site.
+ Tor is a good solution to mask the user’s location from these servers. But large mega corporations
+ that own social media and advertising networks use a whole profile of information that is designed to track users
+ across devices and IP addresses. These profiles employ a variety of techniques to identify users, including JavaScript,
+ cookies, tracking IDs, and <a href="https://panopticlick.eff.org/">browser fingerprinting</a>. Because the vast majority
+ of the websites on the internet either load an ad from one of the major networks or embed social media icons with their
+ associated JavaScript, these corporations have built profiles for almost every user online and can track their internet
+ activity across unrelated sites.</p>
+
+ <p>They track every site that is visited, everything that is purchased, every credit card that is used to
+ make a purchase, every address that items are shipped to, and the GPS metadata of every picture that is
+ uploaded to the internet. They build a profile of a user’s age, gender, marital status, address, political affiliations,
+ religious affiliations, family circumstances, number of pets, and everything else they can get their hands on.
+ They even buy up databases of credit card transactions at local stores, so they can track the off-line purchasing patterns of the users
+ in their profiles. Because they already have much more accurate address information about a user than an IP address discloses,
+ Tor provides no real privacy protection against mega corporations.</p>
+
+ <p>The single best privacy protection against mega corporations is to browse the web with JavaScript disabled, followed
+ by blocking ad networks, disabling cookies and DOM storage, and using a browser that is difficult to fingerprint.</p>
+
+
+ <h3>Using Tor</h3>
+
+ <p>Despite its limitations, Tor can be useful in some circumstances. The Tor project has an app for Android called Orbot,
+ which is available on <a href="https://f-droid.org/repository/browse/?fdfilter=orbot&fdid=org.torproject.android">F-Droid</a>
+ and everywhere else that Privacy Browser is distributed. Privacy Browser has a setting to use Orbot as
+ a proxy. When this is turned on, Privacy Browser’s app bar will have a light blue background instead of
+ the default light grey. When Privacy Browser’s Orbot proxy setting is enabled, internet access
+ will not work unless Orbot is running and connected to Tor. Because traffic is being routed through several Tor nodes,
+ using Tor is often much slower than connecting directly to the internet.</p>
+
+ <img class="center" src="images/tor.png">
+ </body>
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