Install kgpg by entering the following commands in the terminal:
sudo apt update sudo apt install kgpg
Description:
graphical front end for GNU Privacy Guard
Kgpg manages cryptographic keys for the GNU Privacy Guard, and can encrypt, decrypt, sign, and verify files. It features a simple editor for applying cryptography to short pieces of text, and can also quickly apply cryptography to the contents of the clipboard. . This package is part of the KDE Utilities module.
Homepage: http://www.kde.org/
Version: 4:17.12.3-0ubuntu1
Section: universe/kde