If you don't have an existing GPG key, you can generate a new GPG key to use for signing commits and tags.
Supported GPG key algorithms
GitHub supports several GPG key algorithms. If you try to add a key generated with an unsupported algorithm, you may encounter an error.
Generating a GPG key
Note: Before generating a new GPG key, make sure you've verified your email address. If you haven't verified your email address, you won't be able to sign commits and tags with GPG. For more information, see "Verifying your email address."
- Download and install the most recent version of the GPG command line tools for your operating system. You will need version 2.1 or greater to follow the instructions below.
Open TerminalTerminalGit Bash.
Paste the text below to generate a GPG key pair.
$ gpg --full-generate-key
At the prompt, specify the kind of key you want, or press
Enterto accept the default
RSA and RSA.
- Enter the desired key size. We recommend the maximum key size of
- Enter the length of time the key should be valid. Press
Enterto specify the default selection, indicating that the key doesn't expire.
- Verify that your selections are correct.
Enter your user ID information.
Note: When asked to enter your email address, ensure that you enter the verified email address for your GitHub account. For more information, see "Verifying your email address."
Type a secure passphrase.
gpg --list-secret-keys --keyid-format LONGcommand to list 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.
From the list of GPG keys, copy the GPG key ID you'd like to use. In this example, the GPG key ID is
gpg --list-secret-keys --keyid-format LONG /Users/hubot/.gnupg/secring.gpg ------------------------------------ sec 4096R/3AA5C34371567BD2 2016-03-10 [expires: 2017-03-10] uid Hubot
ssb 4096R/42B317FD4BA89E7A 2016-03-10
Paste the text below, 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
Copy your GPG key, beginning with
-----BEGIN PGP PUBLIC KEY BLOCK-----and ending with
-----END PGP PUBLIC KEY BLOCK-----.
- Add the GPG key to your GitHub account.