fSekrit is a small application for keeping securely encrypted notes. These notes are truly stand-alone; the editor program and your note are merged together into a tiny self-contained program file, bypassing the need to install a special application to view your data. This makes fSekrit ideal for keeping encrypted notes on, for example, USB flash drives.
Another advantage of using fSekrit is that your un-encrypted data is never stored on your harddisk. With a traditional encryption utility you would have to decrypt your file to disk, view or edit it, and then re-encrypt it. Unless you use secure file wiping tools, it would be a trivial matter for someone to retrieve your un-encrypted data, even though you deleted the temporary file. This is not a viable attack against fSekrit, though, since it never stores your un-encrypted data on disk. (See security notes about swapping and hibernation, though!)
fSekrit uses very strong encryption to ensure that your data is never at risk. Rather than using hocus-pocus home-brewed algorithms, fSekrit uses the standard, military grade, peer-reviewed AES/Rijndael in CBC mode, with a 256-bit keysize.
Self contained fSekrit notefiles are tiny! Only around 50k plus the size of your encrypted text. Furthermore, fSekrit runs across the entire windows range: 9x/NT/2K/XP, 32-bit as well as 64-bit x86 editions.