http://crouse.us/scripts/bash/encryption/sced.sh
Code:
#!/bin/bash
# A Symmetric Cipher Encryption/Decryption program made using Zenity
# Copyright (C) 2007 Dave Crouse - <dave atnospam usalug.org> -All rights reserved
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
You can view a demo of it here:
http://crouse.us/scripts/bash/encryption/sced-DEMO.ogg