Probably one of the easiest things you'll ever do with gpg
Install Keybase: https://keybase.io/download and Ensure the keybase cli is in your PATH
First get the public key
keybase pgp export | gpg --import
Next get the private key
keybase pgp export --secret | gpg --allow-secret-key --import
Verify progress:
gpg --list-secret-keys
Looks for something like
sec 4096R/C9D8E1A1 2017-02-16 [expires: 2033-02-12]
uid Sean Escriva <sean.escriva@gmail.com>
ssb 4096R/CC67212E 2017-02-16
The email address should match your Github email.
The C9D8E1A1 part is what you need next. By default this key is untrusted, so we'll fix that.
To edit trust:
$ gpg --edit-key C9D8E1A1
gpg> trust
Please decide how far you trust this user to correctly verify other users' keys
(by looking at passports, checking fingerprints from different sources, etc.)
1 = I don't know or won't say
2 = I do NOT trust
3 = I trust marginally
4 = I trust fully
5 = I trust ultimately
m = back to the main menu
Your decision? 5
Do you really want to set this key to ultimate trust? (y/N) y
There are many levels of trust so choose what you're comfortable with.
$ git config --global user.signingkey C9D8E1A1
$ git config --global commit.gpgsign true
Now add it to your Github profile:
gpg --armor --export C9D8E1A1 | xclip
Add it to your GitHub profile under Settings/SSH and GPG keys.
Replace xclip with clip or pbcopy for your current platform.
Use gpg agent if you don't want to enter the password every time.
View signed commits with : git log --show-signature -1