GNU privacy guard - S/MIME version

 GnuPG is GNU's tool for secure communication and data storage.
 It can be used to encrypt data and to create digital signatures.
 It includes an advanced key management facility and is compliant
 with the proposed OpenPGP Internet standard as described in RFC4880.
 .
 This package contains the gpgsm program. gpgsm is a tool to provide
 digital encryption and signing services on X.509 certificates and the
 CMS protocol. gpgsm includes complete certificate management.