http://lpiyu33y57lg2ulcihkemzb56inqm4g6jlk7hlgenbqedl4abcfq5aid.onion/workshops/OpenPGP-How-to-Protect-Everything-with-Pretty-Good-Privacy
For example, you can use PGP to keep your Twitter or Instagram DMs private. But wait, there’s more! You can use it to password-protect files so that Google or Dropbox can’t read them. You can use PGP to detect spoofed messages, inauthentic files, and corrupted downloads.