TrueCrypt is a software system for establishing and
maintaining an on-the-fly-encrypted drive. On-the-fly
encryption means that data are automatically encrypted
or decrypted right before they are loaded or saved,
without any user intervention. No data stored on an
encrypted volume can be read (decrypted) without using
the correct password or correct encryption key. Until
decrypted, a TrueCrypt volume appears to be nothing
more than a series of random numbers. The entire file
system is encrypted (i.e., file names, folder names,
contents of every file, and free space).

This program is the real deal. Unlike other folder
locking applications that can be circumvented by
booting in safe mode or booting from a cd (or even
worse, by terminating the process in Task Manager),
the only way to access the data is to mount it using
TrueCrypt. The best thing about TrueCrypt is that it
is extremely fast.

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