Networked computing is a double-edged sword. Connectivity makes transparent sharing of data through e-mail, Web sites, and ftp archives possible, but it also invites unwanted access to your data.

PGP is based on the public-key encryption method, which uses two keys: One is a public key that the user disseminates to anyone from whom he wants to receive a message; the other is a private key used ...

gpg-mailgate is a small content filter for Postfix + web interface that allows any user to upload PGP keys to your server (and confirm email address), and then will begin encrypting any outgoing mail ...