本报告延续上一篇针对微信朋友圈图片过滤技术的研究，分析微信如何在聊天功能中实现实时图片过滤。微信是中国腾讯控股有限公司旗下的即时通讯应用，目前是中国最受欢迎的聊天软件之一，也是全球排名第四的最流行聊天软件。朋友圈是微信上最常用的功能之一，其中图片是用户最期望看到的内容分享形式。

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.

In this report we provide the first systematic study of keyword and website censorship on WeChat, the most popular chat app in China

This report describes privacy and security issues with the Windows and Android versions of QQ Browser. Our research shows that both versions of the application transmit personally identifiable data without encryption or with easily decrypted encryption, and do not adequately protect the software update process.

A new report from the University of Toronto’s Citizen Lab identifies security and privacy issues in QQ Browser, a mobile browser produced by China-based Internet giant Tencent, which may put many millions of users of the application at risk of serious compromise.

多伦多大学公民实验室的最新报告揭露了QQ浏览器存在的多处隐私与安全问题。QQ浏览器是一款由中国网络巨头腾讯开发的移动浏览器，而这些问题很可能会将数以百万的用户至于严峻的风险中。