Create PGP keys
To make a new PGP key:
Press the + button in the top-left corner of the window.
Select GPG Key from the list.
Enter your full name in the Full Name field.
Optionally, add your email address and a comment to describe the key.
Press Create.
In the password dialog, enter a password for the key. Retype the password to confirm your choice.
Press OK to finish.
Passwords and Keys will take some time to generate your key. While your key is being created, move your mouse around, press some keys on your keyboard, or browse the web. This will help Passwords and Keys to create a truly random key. The key will be listed under GnuPG keys.
The Full Name, Email Address and Comment details of a GnuPG key are called the user ID of the key.