Linux.com: CLI for Noobies: The Keys to GnuPG

“The GNU Privacy Guard (a.k.a. GnuPG, or simply gpg) is a free
software implementation of Philip Zimmermann’s notorious, powerful,
and popular program PGP (Pretty Good Privacy). GnuPG is cooler than
a secret decoder ring, so get out of that GUI recliner for a few
minutes and come learn a couple of secret spy crypto command line
tricks.

“GnuPG has two main uses. The first is to encrypt data to ensure
its privacy. The second is to “sign” data so that others can
determine it is authentic and unmodified…”

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