Why is this on top of HN? Their protocol is not secure and they do not encrypt 1:1 chats by default and encrypting group chats with end to end is not even possible!!! Guys, please read http://www.cryptofails.com/post/70546720222/telegrams-crypta... and http://thoughtcrime.org/blog/telegram-crypto-challenge/ and go to more secure things like Threema or Textsecure!