#WECHAT WINDOWS MOMENTS KEYGEN#
By understanding how both the OCR- and visual-based algorithms work, we are able to discover weaknesses in both algorithms that allow one to upload images perceptually similar to those blacklisted but that evade filtering. We also found that the visual-based algorithm is not based on any machine learning approach that uses high level classification of an image to determine whether it is sensitive or not however, we found that the algorithm does possess other surprising properties. We found that the OCR-based algorithm has similarities to many common OCR algorithms in that it converts images to grayscale and uses blob merging to consolidate characters. We found two different algorithms that WeChat Moments uses to filter images: an OCR-based one that filters images containing sensitive text and a visual-based one that filters images that are visually similar to those on an image blacklist. In this report, we present our findings studying the implementation of image filtering on WeChat Moments. However, image censorship on Moments is more complex: an image is filtered according to its content in a way that is tolerant to some modifications to the image. Our previous work found that WeChat uses a hash-based system to filter images in one-to-one and group chats. Previous Citizen Lab research uncovered that WeChat censors content–both text and images–and demonstrates that censorship is heightened around sensitive events. Operating a chat application in China requires following laws and regulations on content control and monitoring.
Because of such perceived privacy, users reported that they frequently share details of their daily life and express personal opinions on Moments. Moments has a relatively high level of intimacy, because a user’s updates on Moments can only be seen by friends who have been verified or selected by the user, and a user can only see interactions of people who are already on their WeChat contact list.
Among WeChat’s many functions, the most frequently used feature is WeChat Moments (朋友圈), which resembles Facebook’s Timeline and allows users to share images, videos, and articles. China’s Ministry of Public Security has been collaborating with Tencent to implement the country’s national identification card system on WeChat.Ĭhinese users spend a third of their mobile online time on WeChat and typically return to the app ten times a day or more. In the past two years, WeChat has transformed beyond a commercial social media platform and become part of China’s e-governance initiatives. The application is owned and operated by Tencent, one of China’s largest technology companies. In February 2018, WeChat reportedly hit one billion monthly active users during the Chinese Lunar New Year. WeChat, ( Weixin 微信 in Chinese), is the dominant chat application in China and fourth largest in the world.
WeChat (the most popular chat app in China) uses two different algorithms to filter images in Moments: an OCR-based one that filters images containing sensitive text and a visual-based one that filters images that are visually similar to those on an image blacklist.
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