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Use GPG on Mac

Authors
  • avatar
    Name
    Gene Zhang
    Twitter

What is GPG?

What's the difference between GPG and OpenSSL?

How to use GPG on Mac

https://www.gnupg.org/gph/en/manual/c14.html#AEN25

Install GPG

brew install gpg

Generate a New Key

% gpg --gen-key

% gpg --full-generate-key
  1. Please select what kind of key you want: (1) RSA and RSA
  2. What keysize do you want? (3072) 4096
  3. Key is valid for? (0)
  4. Is this correct? (y/N) y
  5. GnuPG needs to construct a user ID to identify your key: Enter Real name, Email address, Comment
  6. Enter passphrase: gpg passphrase

Exchanging keys

https://www.gnupg.org/gph/en/manual/x56.html

% gpg --list-keys

[keyboxd]
---------
pub   rsa4096 2025-02-21 [SC]
      29849C24680A97684180469D188DB3A7B6F89CC1
uid           [ultimate] alice (alice-gpg) <alice@gmail.com>
sub   rsa4096 2025-02-21 [E]

gpg --output alice-public.pgp --armor --export alice

It looks like:

-----BEGIN PGP PUBLIC KEY BLOCK-----

mQIN...

Importing a public key:

gpg --import blake.gpg

Encrypting a document:

alice% gpg --output doc.gpg --encrypt --recipient blake@cyb.org doc

Decrypting a document:

blake% gpg --output doc --decrypt doc.gpg
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