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1) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
2) 
3) <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
4) <head>
5)   <title>Tor: Overview</title>
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6)   <meta name="Author" content="Roger Dingledine" />
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7)   <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
8)   <link rel="stylesheet" type="text/css" href="default.css" />
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9)   <link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" />
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10) </head>
11) 
12) <body>
13)   <div class="menu" id="side">
14) <!--    <img id="logo" src="tor.jpg" alt="cute tor gate" /> -->
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15)       <a href="index.html">Home</a> <br />
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16)       <a href="howitworks.html">How it works</a> <br />
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17)       <a href="download.html">Download</a> <br />
18)       <a href="documentation.html">Documentation</a><br />
19)       <a href="contribute.html">Contribute</a> <br />
20)       <a href="developers.html">Developers</a> <br />
21)       <a href="research.html">Research</a> <br />
22)       <a href="people.html">People</a> <br />
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23)   </div><!-- #side -->
24)   <div class="main" id="main">
25)
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26) <h2>Tor: Overview</h2>
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27) 
28) <p>
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29) Tor is a network-within-a-network that allows people and groups to
30) improve their privacy and security on the Internet.  It also enables
31) future software developers to create new kinds of communication tools
32) that have built-in privacy features.  Tor can provide the foundation for
33) a whole range of applications that allow organizations and individuals
34) to share information over public networks without compromising their
35) privacy.
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36) </p>
37) 
38) <p>
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39) Individuals can use Tor to shield themselves and their family members
40) from being tracked by remote websites.  They can also use it to connect
41) to resources such as news sites or instant messaging services that are
42) blocked by their local Internet service providers (ISPs).
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43) </p>
44) 
45) <p>
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46) Groups such as the German "Diabetes People" organization recommend Tor
47) for safeguarding their members' online privacy and security.  Activist
48) groups like the Electronic Frontier Foundation (EFF) are supporting
49) Tor's development as a mechanism for maintaining civil liberties online.
50) Corporations are investigating Tor as a safe way to conduct competitive
51) analysis, and are considering using Tor to test new experimental projects
52) without associating their names with these projects. A branch of the
53) US Navy uses Tor for open source intelligence gathering, and one of its
54) teams used Tor while deployed in the Middle East recently.
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55) </p>
56) 
57) <p>
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58) The variety of people who use Tor is actually part of what makes it
59) so secure.  The more populous and diverse the user base for Tor is,
60) the more your anonymity will be protected.
61) </p>
62) 
63) <h3>Why We Need Tor</h3>
64) 
65) <p>
66) Using Tor protects you against a common form of Internet surveillance
67) known as "traffic analysis."  Traffic analysis can be used to infer
68) who is talking to whom over a public network.  Knowing the source
69) and destination of your Internet traffic allows others to track your
70) behavior and interests.  This can impact your checkbook if, for example,
71) an e-commerce site uses price discrimination based on your country or
72) institution of origin.  It can even threaten your job and physical safety
73) by revealing who and where you are.
74) </p>
75) 
76) <p>
77) How does traffic analysis work?  Internet data packets have two parts:
78) a data payload, and a header used for routing.  The data payload is
79) whatever is being sent, whether that's an email message, a web page, or an
80) audio file.  Even if you encrypt the data payload of your communications,
81) traffic analysis still reveals a great deal about what you're doing and,
82) possibly, what you're saying.  That's because it focuses on the header,
83) which discloses source, destination, size, timing, and so on.
84) </p>
85) 
86) <p>
87) A basic problem, for the privacy minded, is that the recipient of your
88) communications can see who sent them by looking at headers.  So can
89) authorized intermediaries like Internet service providers, and sometimes
90) unauthorized intermediaries as well.  A very simple form of traffic
91) analysis might involve sitting somewhere between sender and recipient on
92) the network, looking at headers.
93) </p>
94) 
95) <p>
96) But there are also more powerful kinds of traffic analysis.  Some
97) attackers spy on multiple parts of the Internet and use sophisticated
98) statistical techniques to track the communications patterns of many
99) different organizations and individuals.
100) </p>
101) 
102) <h3>The Solution: a Distributed, Anonymous Network</h3>
103) 
104) <p>
105) Tor helps to reduce the risks of both simple and sophisticated traffic
106) analysis by distributing your transactions over several places on the
107) Internet, so no single point can link you to your destination.  The idea
108) is similar to using a twisty, hard-to-follow route in order to throw off
109) somebody who is tailing you -- and then periodically erasing your
110) footprints.  Instead of taking a direct route from source to
111) destination, data packets on the Tor network take a random pathway
112) through several servers that cover your tracks so no observer at any
113) single point can tell where the data came from or where it's going.
114) </p>
115) 
116) <p>
117) To create a private network pathway with Tor, the user's software or
118) client incrementally builds a circuit of encrypted connections through
119) servers on the network.  The circuit is extended one hop at a time, and
120) each server along the way knows only which server gave it data and which
121) server it is giving data to.  No individual server will ever know the
122) complete path that a data packet has taken.  The client negotiates a
123) separate set of encryption keys for each hop along the circuit to ensure
124) that each hop can't see what these connections are as they pass through.
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125) </p>
126) 
127) <p>
128) [Insert snazzy onion diagram here.]
129) </p>
130) 
131) <p>
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132) Once a circuit has been established, many kinds of data can be exchanged
133) and several different sorts of software applications can be deployed
134) over the Tor network.  Because each server sees no more than one hop in
135) the circuit, neither an eavesdropper nor a compromised server can use
136) traffic analysis to link the connection's source and destination.  Tor
137) only works for TCP streams and can be used by any application with SOCKS
138) support.
139) </p>
140) 
141) <p>
142) For efficiency, the Tor software uses the same circuit for connections
143) that happen within the same minute or so.  Later requests are given a
144) new circuit, to keep people from linking your earlier actions to the new
145) ones.
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146) </p>
147)
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148) <h3>Hidden Services</h3>
149)
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150) <p>
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151) Tor also makes it possible for users to hide their locations while
152) offering various kinds of services, such as web publishing or an instant
153) messaging server.  Using Tor "rendezvous points," other Tor users can
154) connect to these hidden services, each without knowing the other's
155) network identity.  This hidden service functionality could allow Tor
156) users to set up a website where people publish material without worrying
157) about censorship.  Nobody would be able to determine who was offering
158) the site, and nobody who offered the site would know who was posting to it.
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159) </p>
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160) 
161) <h3>Staying Anonymous</h3>
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162) 
163) <p>
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164) Of course, Tor can't solve all anonymity problems.  It focuses only on
165) protecting the transport of data.  You need to use protocol-specific
166) support software if you don't want the sites you visit to see your
167) identifying information.  For example, web proxies such as Privoxy can
168) be used while web browsing to block cookies and withhold information
169) about your browser type.
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170) </p>
171) 
172) <p>
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173) Also, to protect your anonymity, be smart.  Don't provide your name
174) or other revealing information in web forms.  Be aware that like all
175) anonymizing networks that are fast enough for web browsing, Tor does not
176) provide protection against end-to-end timing attacks: if your attacker
177) can watch the traffic coming out of your computer, and also the traffic
178) arriving at your chosen destination, he can use statistical analysis to
179) discover that they are part of the same circuit.
180) </p>
181) 
182) <h3>The Future of Tor</h3>
183) 
184) <p>
185) Providing a usable anonymizing network on the Internet today is an
186) ongoing challenge.  We want software that meets users' needs.  And we
187) also want to keep the network up and running in a way that handles
188) as many users as possible. Security and usability don't have to be at
189) odds: as Tor's usability increases, it will attract more users, which
190) in turn will increase security for everyone. We're making progress,
191) but we need your help.  Please consider <a
192) href="cvs/tor/doc/tor-doc.html#installing">installing</a> a <a
193) href="cvs/tor/doc/tor-doc.html#server">server</a>
194) or <a href="contribute.html">volunteering</a> as a <a
195) href="developers.html">developer</a>.
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196) </p>
197) 
198) <p>
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199) Anonymity is threatened as never before by trends in law, policy, and
200) technology that are undermining our ability to speak and read freely
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201) online without being forced to reveal who we are.  With each new user
202) and server, we enhance Tor's ability to restore people's control over
203) their privacy.
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204) </p>
205) 
206)   </div><!-- #main -->
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207)   <div class="bottom" id="bottom">
208)      <i><a href="mailto:tor-webmaster@freehaven.net">Webmaster</a></i> -
209)      $Id$
210)   </div>