Knox

Nox is a security tool that helps you protect the information stored on the hard drive by creating 'vaults', which separates your data from the rest of your system.

Using the AAS algorithm, the app encrypts files stored in its vaults. Encryption chain length can be 128 bits or 256 bits.

Each vault might hold a full volume of your hard drive from a program file. Vaults behave like disk images and mount and unmount similarly.

You can copy your personal copies using nanox and save them inside your vaults. Another interesting feature allows you to integrate the vault content into the spotlight search function. (This feature is only if you register the program.) 

Notes

For Mac OS X 10.4.11 or later.