2016 — Telegram: Despite Telegram's claims of super security,… 2016 15.0M records affected Share on X Technical writeup Despite Telegram's claims of super security, they've been hacked by a group called Rocket Kitten. Root cause Hacked Referenceshttp://venturebeat.com/2016/08/02/hackers-break-into-telegram-revealing-15-million-users-phone-numbers/