MTProto securityhttps://eprint.iacr.org/2015/1177.pdfhttp://unhandledexpression.com/2013/12/17/telegram-stand-back-we-know-maths/http://www.cryptofails.com/post/70546720222/telegrams-cryptanalysis-contesthttp://cs.au.dk/~jakjak/master-thesis.pdfhttps://moxie.org/blog/telegram-crypto-challenge/