Stateless OpenPGP (SOP) # The “Stateless OpenPGP Command Line Interface” is an evolving specification of a vendor-agnostic way to use OpenPGP. The SOP specification outlines a “generic stateless command-line interface for dealing with OpenPGP messages, certificates, and secret key material”. Many tools, based on a wide range of OpenPGP libraries, implement the SOP standard. In this text we will often use SOP tools to explore OpenPGP concepts, since they are (by design) both easy to us...