GnuPG is GNU's tool for secure communication and data storage. This
package adds support for smart cards and S/MIME encryption and signing
to the base GnuPG package
gpgsm gpgsm is a tool similar to gpg to provide digital encryption and signing services on X.509 certificates and the CMS protocol. It is mainly used as a backend for... scdaemon The scdaemon is a daemon to manage smartcards. It is usually invoked by gpg-agent and in general not used directly.