http://secure45nbquibuw6thmenrfamhobdkkrllgxrtayn4sgmnexremexyd.onion/messengers.html
Telegram uses custom, unaudited encryption and the first
version of MTProto had severe security issues , but these were fixed with MTProto 2.0. However, Telegram still uses strange
cryptographic primitives, such as AES-IGE, for "performance", although they use it in a way that they aren't
affected by its known security issues .