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Rescuing 1 sources and tagging 0 as dead. #IABot (v1.3beta4) (DragonflySixtyseven) |
Rescuing 5 sources and tagging 0 as dead. #IABot (v1.4.2) |
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==Purpose==
As of January 2005, BitTorrent traffic made up more than a third of total residential internet traffic,<ref>{{cite web|url=https://www.wired.com/wired/archive/13.01/bittorrent.html|title=The Bittorrent Effect|publisher=Wired|date=2007-05-30}}</ref> although this dropped to less than 20% as of 2009.<ref>{{cite web|url=http://www.sandvine.com/downloads/documents/2009%20Global%20Broadband%20Phenomena%20-%20Executive%20Summary.pdf|title=2009 Global Broadband Phenomena|publisher=Sandvine.com|date=2009-11-16|deadurl=yes|archiveurl=https://web.archive.org/web/20091122162729/http://www.sandvine.com/downloads/documents/2009%20Global%20Broadband%20Phenomena%20-%20Executive%20Summary.pdf|archivedate=2009-11-22|df=}}</ref> Some ISPs deal with this traffic by increasing their capacity whilst others use specialised systems to slow peer-to-peer traffic to cut costs. Obfuscation and encryption make traffic harder to detect and therefore harder to throttle. These systems were designed initially to provide [[anonymity]] or [[confidentiality]], but became required in countries where [[Internet Service Providers]] were granted the power to throttle BitTorrent users and even ban those they believed were guilty of illegal file sharing.
==History==
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* [[Transmission (BitTorrent client)|Transmission]] supports MSE/PE as of Transmission-0.90.<ref>{{cite web|url=http://transmission.m0k.org/forum/viewtopic.php?t=2631|title=Transmission 0.90 Released! |publisher=Transmission.m0k.org forum|date=2007-10-24|archiveurl=https://web.archive.org/web/20071027022525/http://transmission.m0k.org/forum/viewtopic.php?t=2631|archivedate=2007-10-27}}</ref>
* [[Vuze]] (formerly Azureus) supports the final spec since 25 January 2006 (CVS snapshot 2307-B33).<ref>{{cite web|url=http://sourceforge.net/mailarchive/forum.php?thread_name=200601252228.k0PMSnp0024117%40aelitis.com&forum_name=azureus-commitlog|title=[Azureus-commitlog] CVS Snapshot Azureus2307-B33.jar has been released !|publisher=Sourceforge.net|date=2006-01-25}}</ref> Azureus version 2.4.0.0 was released 10 February 2006, and was the first stable version of a client to support MSE/PE. However, glitches in Azureus' implementation resulted in improperly encrypted pieces that failed hash checking. The glitches were rectified as of version 2.4.0.2.<ref>{{cite web|url=http://azureus.sourceforge.net/changelog.php?version=2.4.0.2|title=Azureus : Java BitTorrent Client - Changelog|publisher=Azureus.sourceforge.net}}</ref>
* [[µTorrent]] premiered MSE/PE 4 days after Azureus with beta 1.4.1 build 407.<ref>{{cite web|url=http://forum.utorrent.com/viewtopic.php?id=5384|title=µTorrent 1.4.2 beta 435|publisher=uTorrent Announcements|date=2006-01-29|deadurl=yes|archiveurl=https://web.archive.org/web/20060514085453/http://forum.utorrent.com/viewtopic.php?id=5384|archivedate=2006-05-14|df=}}</ref> µTorrent version 1.5 (build 436) was released on 7 March 2006; it was the first stable version of µTorrent with PE.<ref>[http://forum.utorrent.com/viewtopic.php?id=7199 "µTorrent 1.5 released"] {{webarchive|url=https://web.archive.org/web/20130529090641/http://forum.utorrent.com/viewtopic.php?id=7199 |date=2013-05-29 }}. uTorrent Announcements. 2006-03-07.</ref>
==Operation==
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==Criticism==
[[Bram Cohen]], the inventor of [[BitTorrent (protocol)|BitTorrent]], opposed adding encryption to the BitTorrent protocol. Cohen stated he was worried that encryption could create incompatibility between clients. He also stressed the point that the majority of ISPs don't block the torrent protocol. In 2006 Cohen wrote "I rather suspect that some developer has gotten rate limited by his ISP, and is more interested in trying to hack around his ISP's limitations than in the performance of the internet as a whole".<ref>{{cite web|url=http://bramcohen.livejournal.com/29886.html |title=Obfuscating BitTorrent |last=Cohen |first=Bram |authorlink=Bram Cohen |publisher=Bram Cohen blog |date=2006-01-29 |deadurl=yes |archiveurl=https://web.archive.org/web/20060207023731/http://bramcohen.livejournal.com/29886.html |archivedate=2006-02-07 |df= }}</ref> Many BitTorrent community users responded strongly against Cohen's accusations.<ref>{{cite web|url=http://forum.utorrent.com/viewtopic.php?id=5742|title=Debate over Protocol Encryption|publisher=uTorrent.com forum|date=2006-02-04|deadurl=yes|archiveurl=https://web.archive.org/web/20071022175414/http://forum.utorrent.com/viewtopic.php?id=5742|archivedate=2007-10-22|df=}}</ref>
Cohen later added encrypted connections to his [[BitTorrent (software)|Mainline client]]<ref>{{cite web|url=http://www.bittorrent.com/versionnotes.html|title=BitTorrent Mainline Version History|publisher=BitTorrent.com|date=2006-10-15|archiveurl=https://web.archive.org/web/20070225131829/http://www.bittorrent.com/versionnotes.html|archivedate=2007-02-25}}</ref> with the ability to receive but not originate them.{{citation needed|date=April 2013}} Notably, when µTorrent was purchased by BitTorrent, Inc. and then became the next mainline release, the ability to originate encrypted connections was retained, but it became turned off by default. In an interview in 2007, Cohen stated "The so-called ‘encryption’ of BitTorrent traffic isn’t really encryption, it’s obfuscation. It provides no anonymity whatsoever, and only temporarily evades traffic shaping."<ref>[http://torrentfreak.com/interview-with-bram-cohen-the-inventor-of-bittorrent/ "Interview with Bram Cohen, the inventor of BitTorrent"]. TorrentFreak. 2007-01-17. Retrieved 2013-04-07.</ref>
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* [http://yro.slashdot.org/story/06/02/06/2039241/bittorrent-and-end-to-end-encryption "BitTorrent and End to End Encryption"]. Slashdot.
* [http://bittorrent.org/beps/bep_0008.html "Tracker Peer Obfuscation"]. BitTorrent.org.
* [https://web.archive.org/web/20121109160226/http://sourceforge.net/apps/mediawiki/spid/index.php?title=Identifying_the_Message_Stream_Encryption_
* [http://www.cisco.com/en/US/products/ps5855/products_configuration_example09186a0080ac3082.shtml "Block P2P Traffic on a Cisco IOS Router using NBAR"]. Cisco.
* [http://gotux.net/arch-linux/aria2c-downloader-through-vpn-tunnel/ "Aria2c VPN/Proxy Tutorial"]. GoTux.
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