TIM 2.2.6 ，签名问题同上面发的轻聊版。修改内容比较多，只说部分：功能去掉了内置邮箱、福利、日程、预置大表情等还有一大堆我认为不会被用到或没有用的东西；可以防撤回、闪照无限查看并截屏；支持 Android 5.0+ 概览界面卡片标题变色，8.1+ 导航栏变色；可以直接手动选取位置发送；长按底部“办公” tab 可以彻底退出。没有强行呆在后台的流氓行为，要保持接收消息请不要从概览界面清除掉。
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Secret Chats are one of the service’s additional security features; it allows messages to be sent with client-to-client encryption. This setup means that, unlike regular messages, these secret messages can only be accessed from the device’s that initiated and accepted the chat. Additionally, Telegram notes that secret chats leave no trace on the company’s services and offer a self-destruct timer.
Telegram has no known backdoors and, even though it is come in for criticism for using proprietary encryption methods instead of open-source ones, those have yet to be compromised. While no messaging app can guarantee a 100% impermeable defense against determined attackers, Telegram is vulnerabilities are few and either theoretical or based on spoof files fooling users into actively enabling an attack.
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