PGP Public Key should be made available to customers to encrypt their messages.
Information may be encrypted by means of the PGPEncrypter Java tool in Parallels H-Sphere:
java psoft.hsphere.tools.PGPEncrypter -m "This is a message to encrypt" -f "This is a file where encrypted phrase will be saved" -k "/path/to/PGP_Public_Key/file"