They simply create accounts on ProtonMail, which is quite simple and takes a few moments, and all the key encryption and generation is happening automatically in the background as Bob is creating his account.
Jednostavno kreiraju ProtonMail račun, što je vrlo jednostavno i  traje nekoliko minuta, dok se sva ključna enkripcija i generacija odvija automatski u pozadini za vrijeme kreiranja računa.