Passive Privacy System
PPS is a specification for email programs to follow to exchange public keys and encrypt mail. There is no PPS ``program, though. Each email system may find its own way to impliment PPS, and may have different criteria for the user-interface
pps.sourceforge.net
Title: The Passive Privacy System Home Page
Description: The Passive Privacy System home contains specifications and
news regarding the best way to protect email
Keywords: pps security encryption privacy email gpg gnupg mime