http://hhldo3tnt5solzj2bwfvh7xm4slk2forpjwjyemhcfrlob5gq75gioid.onion/en/index.html
After it's installed, you can close any windows that it creates. GnuPG, OpenPGP, what? In general, the terms GnuPG, GPG, GNU Privacy Guard, OpenPGP and PGP
are used interchangeably. Technically, OpenPGP (Pretty Good Privacy) is the
encryption standard, and GNU Privacy Guard (often shortened to GPG or GnuPG)
is the program that implements the standard.