FreeSecurity is an easy to use, graphical, freeware application that allows you to use encryption to secure your files. FreeSecurity uses strong 128-bit AES encryption (according to NIST, it would take about 149 trillion years to break an AES key using usual methods), the new US government encryption standard, which offers a great level of protection to your files.
Additionally, it offers file compression on the encrypted files. For instance, you can simply place it on a USB storage device and have free, easy, and mobile file security, as it doesn't require installation you can run it directly from the USB pen. Runs on Windows, MacOS, Linux, Solaris and any OS with Java support.