If you need to import a PGP key, you have likely received or will soon receive an encrypted message from the sender of the key. To decrypt and read the message, you must first import the key to your Mac. To accomplish the task, you need the GPG Tools for Mac application installed on the computer. The Gnu PG application is the encryption program included in the tool set that is used to generate and store PGP keys on Macs with OS X. Once the software is installed, you can import the key and decrypt messages from the sender. You can also generate your own key to send encrypted messages to recipients. Writer Bio

How to Import a PGP Key for Mac OS X - 55