Note that the article employs unwarranted FUD in regards to the auth_key_id, which is fully equivalent to a TLS session ticket, used, like in TLS, to avoid repe

Note that the article employs unwarranted FUD in regards to the auth_key_id, which is fully equivalent to a TLS session ticket, used, like in TLS, to avoid repeating the handshake each time a new connection is established (and on top of that, the MTProto auth key ID is also rotated every 24 hours).