⭕1. Interface

❊ Enabling

To see if GPG / PGP is enabled on a Yubikey, download the Yubikey Manager software.

Once the software is installed, launch the application.

At the top of the menu, select Interfaces.

There are two categories in the above image: USB and NFC.

Type	Description
USB	The modules checked will be enabled on your yubikey when you physically plug your yubikey into a USB port.
NFC	The modules checked on the right side will be enabled when you tab your yubikey against a NFC enabled cell phone or NFC device.

Ensure that the OpenPGP module is indeed checked for the side you wish to utilize. You can enable both USB and NFC if you are unsure.

❊ Interface

Unlike PIV, the GPG module does not have an accessible interface from the Yubikey Manager software itself.

You can manage GPG keys from the command-line, or from programs like Kleopatra which allow you to manage the GPG aspect of your Yubikey / smartcard.

If you wish to use a program with an actual interface, you can try Kleopatra by installing Gpg4Win.

For MacOS users, please take a look at this list of alternatives since Kleopatra is limited to Windows and Linux only.