A profile of Pavel Durov's older brother Nikolai, who is reportedly still in Russia and is responsible for Telegram's encryption standard MTProto protocol (Eva Hartog/Politico)

Eva Hartog / Politico:
A profile of Pavel Durov's older brother Nikolai, who is reportedly still in Russia and is responsible for Telegram's encryption standard MTProto protocol  —  Nikolai Durov, who is also wanted by cops in France, is responsible for the messaging app's encryption standard.