CPG stands for COMU Privacy Guard. It is a security tool. In essence it is a web based shell of Gnu Privacy Guard. It enables users to perform main functions of GnuPG on the web.
CPG has two branchs:
The first one must be installed on an email server. Log-in process of this branch uses /etc/passwd. Hence, just real users of
the email server can use CPG.
The second branch can be installed on any web server that does not need to be an email server. Log-in
process of this branch uses
MySQL database. Hence anyone can be a user of CPG with any name or any email address.
It is currently for Linux, Apache webserver and gnupg-1.0.6-5 only.