This report demonstrates the technical underpinnings of how WeChat image censorship operates and suggests possible evasion strategies.| The Citizen Lab
In this report we take an in-depth look at how WeChat, the most popular chat app in China, censored content related to the NCPC19.| The Citizen Lab
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.| The Citizen Lab
This document provides a summary of the Citizen Lab's WeChat surveillance research findings, as well as questions and answers from the resesearch team.| The Citizen Lab