KGpg is a simple interface for GnuPG, a powerful encryption utility. GnuPG (also known as gpg) is included in most distributions and should be installed on your system. You can get the latest version on https://gnupg.org.
With KGpg you will be able to encrypt and decrypt your files and emails, allowing much more secure communications. A mini howto on encryption with gpg is available on GnuPG's web site.
With KGpg, you don't need to remember gpg's command lines and options. Almost everything can be done with a few mouse clicks.