And then they can try again knowing that it's probably something more similar to `stanleyjobsox` than to `johndoe`.

#### A "professional" attack { #a-professional-attack }

Of course, the attackers would not try all this by hand, they would write a program to do it, possibly with thousands or millions of tests per second. And they would get just one extra correct letter at a time.

pro.cy
pro.ec
pro.fj
pro.ht
pro.in
pro.mv
pro.om
pro.pr
pro.tt
pro.typeform.com
pro.vn
prochowice.pl
prod
production.aero
productions
prof
prof.pr
profesional.bo
progressive
project.space
promo
properties
property
protection
protonet.io
pru
prudential
pruszkow.pl
prvcy.page
przeworsk.pl
ps
psc.br
psi.br