The MTProto traffic (which can be detected by signature) is wrapped into an obfuscation layer by some clients (including the official one). This layer makes pac

The MTProto traffic (which can be detected by signature) is wrapped into an obfuscation layer by some clients (including the official one). This layer makes packet look like random bytes. Earlier it has a flaw making all packets the same length and some ISPs started blocking packets by length by later it was fixed. This my comment contains more links about protocol and obfuscation: https://news.ycombinator.com/item?id=17888241 https://news.ycombinator.com/item?id=17888241