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

  • 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}}

gpg --encrypt --sign --recipient {{}} --recipient {{}} {{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}}

gpg --export --armor {{}}

gpg --export-secret-keys --armor {{}}