Generating a new SSH key

• Read this to learn how to generate a public/private key pair.

Adding the SSH key to your GitHub account

• Profile > Settings > SSH and GPG keys > New SSH key
• Enter a title of your choice and the public key.
• Change key type to Signing key and click Add SSH key.

Configuring Git to sign commits by default

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git config --global commit.gpgsign true
git config --global gpg.format ssh
git config --global user.signingkey <absolute_path_to_private_key>

References

• Tell Git about your signing key | GitHub Docs
• Signing commits | GitHub Docs