Todd Steward
Founder & Director
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Publications
(Can’t) Picture This 2
An Analysis of WeChat’s Realtime Image Filtering in Chats
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.
