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index.html    27) <h2>Tor: An anonymous Internet communication system</h2>

index.html    28) 
index.html    29) <p>

index.html    30) Tor is a toolset for a wide range of organizations and people that want

index.html    31) to improve their safety and security on the Internet. Using Tor can help
index.html    32) you anonymize web browsing and publishing, instant messaging, IRC, SSH,

index.html    33) and other applications that use the TCP protocol. Tor also provides a
index.html    34) platform on which software developers can build new applications with
index.html    35) built-in anonymity, safety, and privacy features.

index.html    36) </p>
index.html    37) 

index.html    38) <p>

index.html    39) Your traffic is safer when you use Tor, because communications

en/index.wml  40) are bounced around a distributed network of servers, called
en/index.wml  41) <a href="<page overview>">onion routers</a>.  Instead of taking a direct

index.html    42) route from source to destination, data packets on the Tor network take a
index.html    43) random pathway through several servers that cover your tracks so no observer
index.html    44) at any single point can tell where the data came from or where it's going.
index.html    45) This makes it hard for

index.html    46) recipients, observers, and even the onion routers themselves to figure
index.html    47) out who and where you are. Tor's technology aims to provide Internet

index.html    48) users with protection against "traffic analysis," a form of

index.html    49) network surveillance that threatens personal anonymity and privacy,
index.html    50) confidential business activities and relationships, and state security.

index.html    51) </p>
index.html    52) 
index.html    53) <p>

index.html    54) Traffic analysis is used every day by companies, governments, and

index.html    55) individuals that want to keep track of where people and organizations go

index.html    56) and what they do on the Internet.  Instead of looking at the content of

index.html    57) your communications, traffic analysis tracks where your data goes and

index.html    58) when, as well as how much is sent. For example, online advertising
index.html    59) companies like Fastclick and Doubleclick use traffic analysis to record
index.html    60) what web pages you've visited, and can build a profile of your interests

index.html    61) from that. A pharmaceutical company could use traffic analysis to monitor
index.html    62) when the research wing of a competitor visits its website, and track

index.html    63) what pages or products that interest the competitor. IBM hosts a

index.html    64) searchable patent index, and it could keep a list of every query your
index.html    65) company makes. A stalker could use traffic analysis to learn whether
index.html    66) you're in a certain Internet cafe.

index.html    67) </p>
index.html    68) 

index.html    69) <p>

index.html    70) Tor aims to make traffic analysis more difficult by preventing

index.html    71) eavesdroppers from finding out where your communications are going
index.html    72) online, and by letting you decide whether to identify yourself when
index.html    73) you communicate.
index.html    74) </p>
index.html    75) 
index.html    76) <p>
index.html    77) Tor's security is improved as its user base grows and as

en/index.wml  78) more people volunteer to run servers.  Please consider
en/index.wml  79) <a href="<page documentation>">installing it</a> and then

en/index.wml  80) <a href="<cvssandbox>tor/doc/tor-doc-server.html">helping out</a>.

index.html    81) </p>
index.html    82) 
index.html    83) <p>
index.html    84) Part of the goal of the Tor project is to deploy a public testbed for
index.html    85) experimenting with design trade-offs, to teach us how best to provide
index.html    86) privacy online. We welcome research into the security of Tor and related
index.html    87) anonymity systems, and want to hear about any vulnerabilities you find.

index.html    88) </p>
index.html    89) 
index.html    90) <p>
index.html    91) Tor is an important piece of building more safety, privacy, and anonymity
index.html    92) online, but it is not a complete solution.

index.html    93) And remember that this is development code—it's not a good idea to rely

index.html    94) on the current Tor network if you really need strong anonymity.
index.html    95) </p>

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