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brew install gpg

# generate gpg key
gpg --gen-key

# list keys

gpg --list-secret-keys

# export public key 
# then add it to your github account 
gpg --armor --export your_email@example.com

# telling git about you gpg key
git config --global user.signingkey KEY_ID

# how to sin you commit 
git commit -S -m 'something'

# sigh tag
git tag -s 'v1.0'