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## 5 Invoking 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 S/MIME mail processing. `gpgsm` includes a full featured certificate management and complies with all rules defined for the German Sphinx project.

See Option Index, for an index to `GPGSM`’s commands and options.