In this work, we study how Tencent implements image filtering on WeChat. We found that Tencent implements realtime, automatic censorship of chat images on WeChat based on what text is in an image and based on an image’s visual similarity to those on a blacklist. Tencent facilitates this realtime filtering by maintaining a hash index of MD5 hashes of sensitive image files.
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UPDATE: The 2019 Citizen Lab Summer Institute will take place on July 31-August 2 at the University of Toronto in Toronto, Canada. The annual Citizen Lab Summer Institute (CLSI) workshop is a meeting place for researchers and practitioners from academia, civil society, and the private sector who are working on Internet openness, security, and rights…. Read more »
In the days leading up to the 30th anniversary of June 4 1989, YY, a popular live streaming platform in mainland China, updated its keyword blacklists with content focused on Democracy Movement related memorials and activism in Hong Kong.
Held July 31 – August 2 in Toronto, the Citizen Lab Summer Institute (CLSI) workshop is a meeting place for researchers and practitioners from academia, civil society, and the private sector who are working on Internet openness, security, and rights.
The Citizen Lab Summer Institute (CLSI) brings together technologists, political scientists, academics, researchers, activists, artists, and members of civil society to address some the most pressing issues at the centre of technology and human rights.
A new paper by the Citizen Lab investigates how Chinese censorship reaches independent developers and reveals that, while developers include censorship lists in open source projects, there is little apparent similarity in these blacklists, raising several questions about their origins.
New Citizen Lab research reveals how China’s most popular app filters sensitive images and suggests techniques for evasion.
This report demonstrates the technical underpinnings of how WeChat image censorship operates and suggests possible evasion strategies.
The 19th National Communist Party Congress was held from October 18-24 2017. WeChat, China’s most popular chat app, blocked a broad range of content related to the Congress.