Pretty Good Privacy (OpenPGP) is a standard that enables encrypted communication between individuals. You may have received an email with a “NONAME” or “signature.asc” attachment and wondered what it was, or you might have seen an “armored” email wrapped in something like: -----BEGIN PGP SIGNED MESSAGE----- [Plaintext message] -----BEGIN PGP SIGNATURE----- [Jumble of confusing characters] -----END