Researchers shed light on how WeChat censors images in private chats automatically in real time by using a massive and growing index of MD5 cryptographic hashes (Patrick Howell O'Neill/MIT Techn ...)

Patrick Howell O'Neill / MIT Technology Review:
Researchers shed light on how WeChat censors images in private chats automatically in real time by using a massive and growing index of MD5 cryptographic hashes  —  The super app instantly blocks even the images for over 1 billion users and growing.  —  WeChat is a window into the future of the internet in many different ways.