Package seahorse

A GNOME application for managing encryption keys

https://wiki.gnome.org/Apps/Seahorse

Seahorse is a graphical interface for managing and using encryption keys.
It also integrates with nautilus, gedit and other places for encryption
operations. It is a keyring manager.

General Commands (Section 1)
seahorse
Seahorse is a front end for GnuPG - the Gnu Privacy Guard program - that integrates to the GNOME desktop. It is a tool for secure communications and data...