Our network security analysis of the popular social media app, RedNote, revealed a number of issues with both the Android and iOS versions of the app.

微信是一款具有多种功能的应用程序。之前，我们研究了小程序的隐私问题及其监视以及审查文本和图像消息。本研究重点研究微信的网络加密协议及其安全性。

微信有超過十億每月活躍使用者，我們分析了微信使用的主要網路協定 MMTLS 的安全和隱私特性，並發佈了首篇公開的研究報告。

微信是一個具有許多功能的應用程式。之前我們研究過圍繞小程式的隱私問題，以及微信對文字和圖片訊息的監視及審查。在這項研究中，我們主要關注微信的網路加密協定及其安全性。

Research FAQ for the full report “Should We Chat, Too? Security Analysis of WeChat’s MMTLS Encryption Protocol”

This report performs the first public analysis of MMTLS, the main network protocol used by WeChat, an app with over one billion users. The report finds that MMTLS is a modified version of TLS, however some of the modifications have introduced cryptographic weaknesses.

重要：我們建議所有使用者立即更新他們所使用的輸入法軟體以及作業系統。並建議高風險使用者停止使用任何輸入法提供的雲端建議功能，改為使用完全離線的輸入法，以避免資料外洩。

重要：我们建议所有用户立即更新所使用的输入法软件以及操作系统。并建议高风险用户停止使用任何输入法提供的云端建议功能，改为完全离线的输入法，以避免数据外泄。

We analyzed third-party keyboard apps Tencent QQ, Baidu, and iFlytek, on the Android, iOS, and Windows platforms. Along with Tencent Sogou, they comprise over 95% of the market share for third-party keyboard apps in China. This is an FAQ for the full report titled “The not-so-silent type: Vulnerabilities across keyboard apps reveal keystrokes to network eavesdroppers.”

In this report, we examine cloud-based pinyin keyboard apps from nine vendors (Baidu, Honor, Huawei, iFlyTek, OPPO, Samsung, Tencent, Vivo, and Xiaomi) for vulnerabilities in how the apps transmit user keystrokes. Our analysis found that eight of the nine apps identified contained vulnerabilities that could be exploited to completely reveal the contents of users’ keystrokes in transit. We estimate that up to one billion users could be vulnerable to having all of their keystrokes intercepted, constituting a tremendous risk to user security.