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 RFC2440. 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.