This is a step-by-step guide on how to create a GPG key on keybase.io, adding it to a local GPG setup and use it with Git and GitHub.
Although this guide was written for OS X, most commands should work in other operating systems as well.
Discussion on Hacker News.
$ brew install gpg keybaseYou should already have an account with Keybase and be signed in locally using $ keybase login. In case you need to set up a new device first, follow the instructions provided by the keybase command during login.
Make sure your local version of Git is at least 2.0 ($ git --version) to automatically sign all your commits. If that's not the case, use Homebrew to install the latest Git version: $ brew install git.
$ keybase pgp gen --multi
# Enter your real name, which will be publicly visible in your new key: Patrick Stadler
# Enter a public email address for your key: patrick.stadler@gmail.com
# Enter another email address (or <enter> when done):
# Push an encrypted copy of your new secret key to the Keybase.io server? [Y/n] Y
# ▶ INFO PGP User ID: Patrick Stadler <patrick.stadler@gmail.com> [primary]
# ▶ INFO Generating primary key (4096 bits)
# ▶ INFO Generating encryption subkey (4096 bits)
# ▶ INFO Generated new PGP key:
# ▶ INFO user: Patrick Stadler <patrick.stadler@gmail.com>
# ▶ INFO 4096-bit RSA key, ID CB86A866E870EE00, created 2016-04-06
# ▶ INFO Exported new key to the local GPG keychain$ gpg --list-secret-keys
# /Users/pstadler/.gnupg/secring.gpg
# ----------------------------------
# sec 4096R/E870EE00 2016-04-06 [expires: 2032-04-02]
# uid Patrick Stadler <patrick.stadler@gmail.com>
# ssb 4096R/F9E3E72E 2016-04-06
$ git config --global user.signingkey E870EE00
$ git config --global commit.gpgsign true$ open https://github.com/settings/keys
# Click "New GPG key"
$ keybase pgp export -q CB86A866E870EE00 | pbcopy # copy public key to clipboard
# Paste key, save