Editing Great Firewall (section)

=== Proxy distribution ===
The Great Firewall scrapes the IPs of Tor and VPN servers from the official distribution channels, and enumerates them.<ref>{{cite web |url=https://www.youtube.com/watch?v=DX46Qv_b7F4&t=831 |title=28c3: How governments have tried to block Tor |publisher=YouTube |date=2011-12-28 |access-date=2020-02-17 |archive-url=https://web.archive.org/web/20200329110424/https://www.youtube.com/watch?v=DX46Qv_b7F4&t=831 |archive-date=2020-03-29 |url-status=live }}</ref><ref>{{cite web |url=https://www.youtube.com/watch?v=ZB8ODpw_om8&t=743 |title=Roger Dingledine - The Tor Censorship Arms Race The Next Chapter - DEF CON 27 Conference |publisher=YouTube |date=2019-11-15 |access-date=2020-02-17 |archive-url=https://web.archive.org/web/20200329111727/https://www.youtube.com/watch?v=ZB8ODpw_om8&t=743 |archive-date=2020-03-29 |url-status=live }}</ref><ref>{{cite web|url=https://trac.torproject.org/projects/tor/ticket/32117|title=#32117 (Understand and document BridgeDB bot scraping attempts) – Tor Bug Tracker & Wiki|website=trac.torproject.org|date=16 October 2019 |access-date=2020-01-21|archive-url=https://web.archive.org/web/20200327035436/https://trac.torproject.org/projects/tor/ticket/32117|archive-date=2020-03-27|url-status=live}}</ref><ref>{{cite web |url=https://www.youtube.com/watch?v=Wxpl8naHQCs |title=Jinyang Li - Censorship Circumvention via Kaleidoscope |date=31 March 2010 |publisher=YouTube |access-date=2020-05-24 |archive-url=https://web.archive.org/web/20200523012421/https://www.youtube.com/watch?v=Wxpl8naHQCs |archive-date=2020-05-23 |url-status=live }}</ref> The strategy to resist this attack is to limit the quantity of proxy IPs revealed to each user and making it very difficult for users to create more than one identity.<ref>{{cite web |url=https://people.cs.umass.edu/~amir/papers/TorGame.pdf |title=Tor Games |publisher=people.cs.umass.edu |access-date=2020-02-17 |archive-url=https://web.archive.org/web/20200217222223/https://people.cs.umass.edu/~amir/papers/TorGame.pdf |archive-date=2020-02-17 |url-status=live }}</ref><ref>{{cite web |url=https://www-users.cs.umn.edu/~hoppernj/rbridge_ndss13.pdf |title=Data |publisher=www-users.cs.umn.edu |access-date=2020-02-17 |archive-url=https://web.archive.org/web/20190612072343/https://www-users.cs.umn.edu/~hoppernj/rbridge_ndss13.pdf |archive-date=2019-06-12 |url-status=live }}</ref><ref>{{cite web |url=https://censorbib.nymity.ch/pdf/Sovran2008a.pdf |title=Info |publisher=censorbib.nymity.ch |access-date=2020-05-24 |archive-url=https://web.archive.org/web/20160317075430/https://censorbib.nymity.ch/pdf/Sovran2008a.pdf |archive-date=2016-03-17 |url-status=live }}</ref> Academics have proposed solutions such as Salmon, a volunteer-based proxy network designed to combat censorship.<ref>{{cite web |url=https://censorbib.nymity.ch/pdf/Douglas2016a.pdf |title=Info |publisher=censorbib.nymity.ch |access-date=2020-05-24 |archive-date=8 August 2024 |archive-url=https://web.archive.org/web/20240808050043/https://censorbib.nymity.ch/pdf/Douglas2016a.pdf |url-status=live }}</ref><ref>{{cite web |url=https://www.youtube.com/watch?v=RO3wXRn8BfY |title=Frederick Douglas - Salmon: Robust Proxy Distribution for Censorship Circumvention |publisher=YouTube |date=2016-10-10 |access-date=2020-05-24 |archive-url=https://web.archive.org/web/20190204190605/https://www.youtube.com/watch?v=RO3wXRn8BfY |archive-date=2019-02-04 |url-status=live }}</ref><ref>{{cite web |url=https://community.torproject.org/gsoc/salmon-bridge-distribution/ |url-status=dead |archive-url=https://web.archive.org/web/20200626231844/https://community.torproject.org/gsoc/salmon-bridge-distribution/ |archive-date=2020-06-26 |title=Tor Project {{!}} Implementing Salmon as a bridge distribution mechanism}}</ref><ref>{{Cite web|url = https://github.com/net4people/bbs/issues/33|title = Salmon: Robust Proxy Distribution for Censorship Circumvention (PETS 2016) · Issue #33 · net4people/BBS|website = [[GitHub]]|access-date = 24 June 2020|archive-date = 30 November 2020|archive-url = https://web.archive.org/web/20201130083139/https://github.com/net4people/bbs/issues/33|url-status = live}}</ref> Dynamic IPs are quite effective to flush out from blacklists.