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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TrueCrypt is a data codifying system in real time. TrueCrypt automatically codes and decodes data that you extract or record in a determined volume, without needing any user intervention.

This way you can be sure that the data that has been saved in an encrypted drive can`t be read without the password or corresponding encryption key. Until then the data appears as a series of meaningless characters.

TrueCrypt uses AES (256 bits), Blowfish (448 bits), CAST, IDEA and Triple DES algorithms. Also, TrueCrypt includes a complete user`s manual, in PDF format.