GnuPG
The GNU Privacy Guard is an open-source implementation of the OpenPGP cryptography standard. This module provides a PHP wrapper API enabling Drupal developers to make use of GnuPG's encryption/decryption functionality. In addition, the module allows users to upload their public keys and it provides encryption of Drupal's outgoing e-mails to the public key(s) of the recipient(s). See README.txt for the full feature list.
This module requires PHP 5.2 or newer. In addition, the GnuPG command-line tools, specifically the gpg executable, must be installed on the web server.
Note: This project will soon be deprecated in favor of the better-featured and more generic OpenPGP module.
