GitHub

User configuration

git config --global user.name "Marco Antonio Gonzalez Junior"
git config --global user.email "m@rco.sh"

SSH configuration

ssh-keygen -t ed25519 -C "m@rco.sh"

eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519
cat ~/.ssh/id_ed25519.pub

Using the output above, create new Authentication and Signing keys on GitHUb

Testing the configuration

ssh -T git@github.com

SSH commit signature verification

git config --global gpg.format ssh
git config --global user.signingkey ~/.ssh/id_ed25519.pub

When committing changes in your local branch, add the -S flag to the git commit command:

git commit -S -m "YOUR_COMMIT_MESSAGE"
# Creates a signed commit

GPG configuration

gpg --full-generate-key
gpg --list-secret-keys --keyid-format=long
gpg --armor --export <GPG key id>
# 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-----

Note: not using GPG at the moment.