What is “paperkey” Package?

Extract just secret information out of OpenPGP secret keys
For more details: http://www.jabberwocky.com/software/paperkey/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install paperkey.

  brew install paperkey

Now, use paperkey!