Installation macOS You can Install Gpg on macOS using: $ brew install gpg Workflow Getting Existing Key To get an existing key id use: gpg --list-secret-keys --keyid-format LONG The key id will be available at gpg --list-secret-keys --keyid-format LONG /home/foo/.gnupg/pubring.gpg ------------------------------ sec rsa2048/7FFFC09ACAC05FD0 2017-06-02 [SC] [expires: 2019-06-02] 5538B0F643277336BA7F0E457FFFC09ACAC05FD0 uid [ultimate] foo ssb rsa2048/95E8A289DFE77A84 2017-06-02 [E] [expires: 2019-06-02] The key id we want, in this case is 7FFFC09ACAC05FD0. Troubleshooting macOS Can’t access keychain from UI If a program cannot access the keychain from the UI, probably there’s some problem in prompting you for the passphrase.