It's really painful to see Telegram gaining popularity, when it has such glaring errors.
You should instead use OTR on Jabber (ChatSecure [3]), or TextSecure [4] (which now has an Internet delivery mechanism).
[0]: http://thoughtcrime.org/blog/telegram-crypto-challenge/
[1]: https://news.ycombinator.com/item?id=6936539
[2]: http://unhandledexpression.com/2013/12/17/telegram-stand-bac...
[4]: https://play.google.com/store/apps/details?id=org.thoughtcri...