A recently discovered FBI training document shows that US law enforcement can gain limited access to the content of encrypted messages from some secure messaging services like iMessage, Line, and WhatsApp, but not to messages sent via Signal, Telegram, Threema, Viber, WeChat, or Wickr.
Telegram was started in 2013 by the brothers Nikolai and Pavel Durov, the creators of VK, the largest social network in Russia. Telegram Messenger LLP is an independent nonprofit company located in Berlin, Germany, that is not connected to UK.
Launched in 2013 and founded by Russian entrepreneurs Pavel and Nikolai Durov, Telegram is a cloud-based instant-messaging app.