GitHub supports several GPG key algorithms. If you try to add a key generated with an unsupported algorithm, you may encounter an error.
Note: GPG does not come installed by default on macOS or Windows. To install GPG command line tools, see GnuPG's Download page.
Open TerminalTerminalGit Bash.
gpg --list-secret-keys --keyid-format=longcommand to list the long form of the GPG keys for which you have both a public and private key. A private key is required for signing commits or tags.
gpg --list-secret-keys --keyid-format=long
Note: Some GPG installations on Linux may require you to use
gpg2 --list-keys --keyid-format LONGto view a list of your existing keys instead. In this case you will also need to configure Git to use
git config --global gpg.program gpg2.
Check the command output to see if you have a GPG key pair.
If there are no GPG key pairs or you don't want to use any that are available for signing commits and tags, then generate a new GPG key.
If there's an existing GPG key pair and you want to use it to sign commits and tags, you can display the public key using the following command, substituting in the GPG key ID you'd like to use. In this example, the GPG key ID is
gpg --armor --export 3AA5C34371567BD2 Prints the GPG key ID, in ASCII armor format
You can then add your GPG key to your GitHub account.