This page uses 64 Bit Blowfish encryption: a GPL, keyed, symmetric block cipher, designed in 1993 by Bruce Schneier that remains unhacked and one of the fastest 64 Bit block ciphers
This page is designed to run the decryption on your machine, which means that the clear text and password are never sent across any transmitons
As a test you can save this page to your hard drive and run the algorithms with your networks disconnected. The page can also be saved to a USB key or Cell Phone for off line use