A Survey of Worldwide Censorship Techniques

Document Type Expired Internet-Draft (pearg RG)
Authors Joseph Hall  , Michael Aaron  , Stan Adams  , Amelia Andersdotter  , Ben Jones  , Nick Feamster 
Last updated 2021-01-14 (latest revision 2020-07-13)
Replaces draft-hall-censorship-tech
Stream Internet Research Task Force (IRTF)
Intended RFC status (None)
Expired & archived
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Stream IRTF state Active RG Document
Consensus Boilerplate Unknown
Document shepherd Christopher Wood
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to Christopher Wood <caw@heapingbits.net>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes technical mechanisms censorship regimes around the world use for blocking or impairing Internet traffic. It aims to make designers, implementers, and users of Internet protocols aware of the properties exploited and mechanisms used for censoring end-user access to information. This document makes no suggestions on individual protocol considerations, and is purely informational, intended as a reference.


Joseph Hall (hall@isoc.org)
Michael Aaron (michael.drew.aaron@gmail.com)
Stan Adams (sadams@cdt.org)
Amelia Andersdotter (amelia.ietf@andersdotter.cc)
Ben Jones (bj6@cs.princeton.edu)
Nick Feamster (feamster@uchicago.edu)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)