Security tool to encrypt files with custom passwords. FileTwister is a simple, easy to use file encryption tool that allows you to encrypt any files on your computer. The encrypted files are Internet safe and are only about 100 bytes longer than the original file. This means you can send them via e-mail or upload them to servers without losing any information, which makes them ideal for storing sensitive data on the net. By setting up FileTwister as a helper to Netscape (or Internet Explorer) you can make Internet transfers even smoother.