gpg

GNU Privacy Guard. See gpg2 for GNU Privacy Guard 2. Most operating systems symlink gpg to gpg2. More information: https://gnupg.org.

• Create a GPG public and private key interactively:

gpg --full-generate-key

• Sign doc.txt without encryption (writes output to doc.txt.asc):

gpg --clearsign doc.txt

• Encrypt and sign doc.txt for alice@example.com and bob@example.com (output to doc.txt.gpg):

gpg --encrypt --sign --recipient alice@example.com --recipient bob@example.com doc.txt

• Encrypt doc.txt with only a passphrase (output to doc.txt.gpg):

gpg --symmetric doc.txt

• Decrypt doc.txt.gpg (output to stdout):

gpg --decrypt doc.txt.gpg

• Import a public key:

gpg --import public.gpg

• Export public key for alice@example.com (output to stdout):

gpg --export --armor alice@example.com

• Export private key for alice@example.com (output to stdout):

gpg --export-secret-keys --armor alice@example.com