Internal Program Version: GnuPG  2.5.5

GnuPG is the GNU project's complete and free implementation of the OpenPGP
standard as defined by RFC2440. GnuPG allows to encrypt and sign your data
and communication, features a versatile key managment system as well as
access modules for all kind of public key directories. GnuPG, also known as
GPG, is a command line tool with features for easy integration with other
applications. A wealth of frontend applications and libraries are
available. Version 2 of GnuPG also provides support for S/MIME.

http://www.gnupg.org/aegypten2