Another guy has butthurt from Telegram. As I read somewhere telegram guys said that after 1st march 2014 they somehow will allow to perform MITM in that crypto challenge
-29 karma · joined December 16, 2013
And interesting why you think that it's not possible to read most of cryptography/cryptanalysis books and check common mistakes of implementation afterward? Do you really think that this is THAT hard?
Your scepsis would be understandable if they used OWN cryptoalgorithm. However their protocol is based on well known strong crypto.