Telegram, AKA “Stand back, we have Math PhDs!” – Unhandled expression
Telegram might not be the best private messaging tool around. OTR (Off the Record) free software implementations (like https://guardianproject.info/apps/chatsecure/ may rise over those security holes Telegram leave unattended. http://unhandledexpression.com/2013/12/17/telegram-stand-back-we-know-maths/