Crypt_GPG pear.php.net Encryption LGPL GNU Privacy Guard (GnuPG) This package provides an object oriented interface to GNU Privacy Guard (GnuPG). It requires the GnuPG executable to be on the system. Though GnuPG can support symmetric-key cryptography, this package is intended only to facilitate public-key cryptography. This package requires PHP version 5.4.8 or greater.