overview.html (09b05c8b8) - tor-webwml.git

09b05c8b8c148fa4e64e2e76c16efd70bd6d46fa

convert the rest of the pag... Roger Dingledine authored 19 years ago	`1) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" 2) "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">`
first cut of new website Roger Dingledine authored 19 years ago	`3) 4) <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> 5) <head> 6) <title>Tor: Overview</title>`
clean up my meta and br tags Roger Dingledine authored 19 years ago	`7) <meta name="Author" content="Roger Dingledine" />`
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list the favicon on every page Roger Dingledine authored 19 years ago	`10) <link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" />`
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convert the rest of the pag... Roger Dingledine authored 19 years ago	14) <div class="center"> 15) 16) <!-- TITLE BAR & NAVIGATION --> 17) <div class="banner"> 18) <table class="table-banner" cellpadding=0 cellspacing=0> 19) <tr> 20) <td width="110"> 21) <a href="http://tor.eff.org/"><img border="0" src="images/spacer.png" 22) width="110" height="79"></a> 23) </td> 24) <td class="links" valign="top"> 25) <a href="index.html">Home</a> \| 26) <a href="howitworks.html">How It Works</a> \| 27) <a href="download.html">Download</a> \| 28) <a href="documentation.html">Documentation</a> \| 29) <a href="http://wiki.noreply.org/wiki/TheOnionRouter/TorFAQ">FAQ</a> \| 30) <a href="contribute.html">Contribute</a> \| 31) <a href="developers.html">Developers</a> \| 32) <a href="research.html">Research</a> \| 33) <a href="people.html">People</a> 34) </td> 35) </tr> 36) </table> 37) </div> 38) <!-- END TITLE BAR & NAVIGATION --> 39) 40) <div class="main-column">
first cut of new website Roger Dingledine authored 19 years ago	`41)`
give Tor: Overview a differ... Roger Dingledine authored 19 years ago	`42) <h2>Tor: Overview</h2>`
first cut of new website Roger Dingledine authored 19 years ago	`43) 44) <p>`
revised overview text Roger Dingledine authored 19 years ago	`45) Tor is a network-within-a-network that allows people and groups to 46) improve their privacy and security on the Internet. It also enables`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`47) software developers to create new communication tools 48) with built-in privacy features. Tor provides the foundation for 49) a range of applications that allow organizations and individuals`
revised overview text Roger Dingledine authored 19 years ago	`50) to share information over public networks without compromising their 51) privacy.`
first cut of new website Roger Dingledine authored 19 years ago	`52) </p> 53) 54) <p>`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`55) Individuals can use Tor to keep remote websites from tracking them and their 56) family members. 57) They can also use it to connect`
revised overview text Roger Dingledine authored 19 years ago	`58) to resources such as news sites or instant messaging services that are 59) blocked by their local Internet service providers (ISPs).`
first cut of new website Roger Dingledine authored 19 years ago	`60) </p> 61) 62) <p>`
revised overview text Roger Dingledine authored 19 years ago	63) Groups such as the German "Diabetes People" organization recommend Tor 64) for safeguarding their members' online privacy and security. Activist 65) groups like the Electronic Frontier Foundation (EFF) are supporting 66) Tor's development as a mechanism for maintaining civil liberties online. 67) Corporations are investigating Tor as a safe way to conduct competitive 68) analysis, and are considering using Tor to test new experimental projects 69) without associating their names with these projects. A branch of the
website fixes suggested by... Roger Dingledine authored 19 years ago	`70) U.S. Navy uses Tor for open source intelligence gathering, and one of its`
revised overview text Roger Dingledine authored 19 years ago	`71) teams used Tor while deployed in the Middle East recently.`
first cut of new website Roger Dingledine authored 19 years ago	`72) </p> 73) 74) <p>`
revised overview text Roger Dingledine authored 19 years ago	`75) The variety of people who use Tor is actually part of what makes it`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`76) so secure. Tor hides you among the other users on the network, so the more 77) populous and diverse the user base for Tor is,`
revised overview text Roger Dingledine authored 19 years ago	`78) the more your anonymity will be protected. 79) </p> 80)`
clean up tor website furthe... Roger Dingledine authored 19 years ago	`81) <h3>Why we need Tor</h3>`
revised overview text Roger Dingledine authored 19 years ago	82) 83) <p> 84) Using Tor protects you against a common form of Internet surveillance 85) known as "traffic analysis." Traffic analysis can be used to infer 86) who is talking to whom over a public network. Knowing the source 87) and destination of your Internet traffic allows others to track your 88) behavior and interests. This can impact your checkbook if, for example, 89) an e-commerce site uses price discrimination based on your country or 90) institution of origin. It can even threaten your job and physical safety
website fixes suggested by... Roger Dingledine authored 19 years ago	`91) by revealing who and where you are. For example, if you're travelling 92) abroad and you connect to your employer's computers to check or send mail, 93) you can inadvertently reveal your national origin and professional`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`94) affiliation to anyone observing the network, even if the connection`
make it clearer there's mor... Roger Dingledine authored 19 years ago	`95) is encrypted.`
revised overview text Roger Dingledine authored 19 years ago	`96) </p> 97) 98) <p> 99) How does traffic analysis work? Internet data packets have two parts:`
website fixes suggested by... Roger Dingledine authored 19 years ago	`100) a data payload and a header used for routing. The data payload is`
revised overview text Roger Dingledine authored 19 years ago	`101) whatever is being sent, whether that's an email message, a web page, or an 102) audio file. Even if you encrypt the data payload of your communications, 103) traffic analysis still reveals a great deal about what you're doing and, 104) possibly, what you're saying. That's because it focuses on the header, 105) which discloses source, destination, size, timing, and so on. 106) </p> 107) 108) <p>`
website fixes suggested by... Roger Dingledine authored 19 years ago	`109) A basic problem for the privacy minded is that the recipient of your 110) communications can see that you sent it by looking at headers. So can`
revised overview text Roger Dingledine authored 19 years ago	111) authorized intermediaries like Internet service providers, and sometimes 112) unauthorized intermediaries as well. A very simple form of traffic 113) analysis might involve sitting somewhere between sender and recipient on 114) the network, looking at headers. 115) </p> 116) 117) <p> 118) But there are also more powerful kinds of traffic analysis. Some 119) attackers spy on multiple parts of the Internet and use sophisticated 120) statistical techniques to track the communications patterns of many
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`121) different organizations and individuals. Encryption does not help against 122) these attackers, since it only hides the content of Internet traffic, not 123) the headers.`
revised overview text Roger Dingledine authored 19 years ago	`124) </p> 125)`
clean up tor website furthe... Roger Dingledine authored 19 years ago	`126) <h3>The solution: a distributed, anonymous network</h3>`
revised overview text Roger Dingledine authored 19 years ago	`127) 128) <p> 129) Tor helps to reduce the risks of both simple and sophisticated traffic 130) analysis by distributing your transactions over several places on the 131) Internet, so no single point can link you to your destination. The idea 132) is similar to using a twisty, hard-to-follow route in order to throw off`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`133) somebody who is tailing you—and then periodically erasing your`
revised overview text Roger Dingledine authored 19 years ago	`134) footprints. Instead of taking a direct route from source to 135) destination, data packets on the Tor network take a random pathway 136) through several servers that cover your tracks so no observer at any 137) single point can tell where the data came from or where it's going. 138) </p> 139)`
remove 'align' incant that... Roger Dingledine authored 19 years ago	`140) <img alt="tor circuit step one" src="img/htw1.png" /> 141) <img alt="tor circuit step two" src="img/htw2.png" />`
put ren's how-tor-works dia... Roger Dingledine authored 19 years ago	`142)`
revised overview text Roger Dingledine authored 19 years ago	`143) <p> 144) To create a private network pathway with Tor, the user's software or 145) client incrementally builds a circuit of encrypted connections through 146) servers on the network. The circuit is extended one hop at a time, and 147) each server along the way knows only which server gave it data and which`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`148) server it is giving data to. No individual server ever knows the`
revised overview text Roger Dingledine authored 19 years ago	`149) complete path that a data packet has taken. The client negotiates a 150) separate set of encryption keys for each hop along the circuit to ensure`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`151) that each hop can't trace these connections as they pass through.`
first cut of new website Roger Dingledine authored 19 years ago	`152) </p> 153)`
remove 'align' incant that... Roger Dingledine authored 19 years ago	`154) <img alt="tor circuit step three" src="img/htw3.png" />`
first cut of new website Roger Dingledine authored 19 years ago	`155) 156) <p>`
revised overview text Roger Dingledine authored 19 years ago	157) Once a circuit has been established, many kinds of data can be exchanged 158) and several different sorts of software applications can be deployed 159) over the Tor network. Because each server sees no more than one hop in 160) the circuit, neither an eavesdropper nor a compromised server can use 161) traffic analysis to link the connection's source and destination. Tor 162) only works for TCP streams and can be used by any application with SOCKS 163) support. 164) </p> 165) 166) <p> 167) For efficiency, the Tor software uses the same circuit for connections 168) that happen within the same minute or so. Later requests are given a 169) new circuit, to keep people from linking your earlier actions to the new 170) ones.
first cut of new website Roger Dingledine authored 19 years ago	`171) </p> 172)`
remove 'align' incant that... Roger Dingledine authored 19 years ago	`173) <img alt="tor circuit step four" src="img/htw4.png" />`
put ren's how-tor-works dia... Roger Dingledine authored 19 years ago	`174)`
clean up tor website furthe... Roger Dingledine authored 19 years ago	`175) <h3>Hidden services</h3>`
revised overview text Roger Dingledine authored 19 years ago	`176)`
first cut of new website Roger Dingledine authored 19 years ago	`177) <p>`
revised overview text Roger Dingledine authored 19 years ago	178) Tor also makes it possible for users to hide their locations while 179) offering various kinds of services, such as web publishing or an instant 180) messaging server. Using Tor "rendezvous points," other Tor users can 181) connect to these hidden services, each without knowing the other's 182) network identity. This hidden service functionality could allow Tor 183) users to set up a website where people publish material without worrying 184) about censorship. Nobody would be able to determine who was offering 185) the site, and nobody who offered the site would know who was posting to it.
first cut of new website Roger Dingledine authored 19 years ago	`186) </p>`
revised overview text Roger Dingledine authored 19 years ago	`187)`
clean up tor website furthe... Roger Dingledine authored 19 years ago	`188) <h3>Staying anonymous</h3>`
first cut of new website Roger Dingledine authored 19 years ago	`189) 190) <p>`
Apply strunk&white, clarify... Nick Mathewson authored 19 years ago	`191) Tor can't solve all anonymity problems. It focuses only on`
revised overview text Roger Dingledine authored 19 years ago	`192) protecting the transport of data. You need to use protocol-specific 193) support software if you don't want the sites you visit to see your`
website fixes suggested by... Roger Dingledine authored 19 years ago	`194) identifying information. For example, you can use web proxies such as 195) Privoxy while web browsing to block cookies and withhold information`
revised overview text Roger Dingledine authored 19 years ago	`196) about your browser type.`
first cut of new website Roger Dingledine authored 19 years ago	`197) </p> 198) 199) <p>`
revised overview text Roger Dingledine authored 19 years ago	`200) Also, to protect your anonymity, be smart. Don't provide your name`
website fixes suggested by... Roger Dingledine authored 19 years ago	`201) or other revealing information in web forms. Be aware that, like all`
revised overview text Roger Dingledine authored 19 years ago	`202) anonymizing networks that are fast enough for web browsing, Tor does not`
website fixes suggested by... Roger Dingledine authored 19 years ago	`203) provide protection against end-to-end timing attacks: If your attacker`
revised overview text Roger Dingledine authored 19 years ago	`204) can watch the traffic coming out of your computer, and also the traffic 205) arriving at your chosen destination, he can use statistical analysis to 206) discover that they are part of the same circuit. 207) </p> 208)`
clean up tor website furthe... Roger Dingledine authored 19 years ago	`209) <h3>The future of Tor</h3>`
revised overview text Roger Dingledine authored 19 years ago	`210) 211) <p>`
website fixes suggested by... Roger Dingledine authored 19 years ago	`212) Providing a usable anonymizing network on the Internet today is an 213) ongoing challenge. We want software that meets users' needs. We also 214) want to keep the network up and running in a way that handles as many 215) users as possible. Security and usability don't have to be at odds: 216) As Tor's usability increases, it will attract more users, which will 217) increase the possible sources and destinations of each communication, 218) thus increasing security for everyone.`
make usability/security dis... Roger Dingledine authored 19 years ago	`219) We're making progress, but we need your help. Please consider`
website fixes suggested by... Roger Dingledine authored 19 years ago	`220) <a href="cvs/tor/doc/tor-doc.html#installing">installing</a> a <a 221) href="cvs/tor/doc/tor-doc.html#server">server</a>`
revised overview text Roger Dingledine authored 19 years ago	`222) or <a href="contribute.html">volunteering</a> as a <a 223) href="developers.html">developer</a>.`
first cut of new website Roger Dingledine authored 19 years ago	`224) </p> 225) 226) <p>`
clean up last paragraph of... Roger Dingledine authored 19 years ago	227) Ongoing trends in law, policy, and technology threaten anonymity as never 228) before, undermining our ability to speak and read freely online. These 229) trends also undermine national security and critical infrastructure by 230) making communication among individuals, organizations, corporations, 231) and governments more vulnerable to analysis. Each new user and server 232) provides additional diversity, enhancing Tor's ability to put control 233) over your security and privacy back into your hands.
first cut of new website Roger Dingledine authored 19 years ago	`234) </p> 235) 236) </div><!-- #main -->`
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decide on a format for cont... Roger Dingledine authored 19 years ago	`238) <div class="bottom" id="bottom">`
convert the rest of the pag... Roger Dingledine authored 19 years ago	`239) <i><a href="mailto:tor-webmaster@freehaven.net" class="smalllink">Webmaster</a></i> -`
decide on a format for cont... Roger Dingledine authored 19 years ago	`240) $Id$ 241) </div>`