Simple Text Enctyptor v0.13 is a simple program that will encrypt and decrypt text using 128-bit AES encryption.
There are two versions to download: Installer and Stand-Alone. The installer, located under the Downloads section in the Setup folder, will install the software on your computer, put a shortcut on your desktop, and put a link in your Start menu. The stand alone is just the Simple Text Encryptor program and the help file compressed in to a ZIP file.
You can unzip the files and place them on a jump/flash/thumb drive, put them on a CD or any other type of portable media.
This software was designed to run on the Windows OS. However, it has been tested on xUbuntu 11.04 using WINE with no issues. There may be issues with the help file depending on what software you are using to read it. The help file is a CHM file.