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TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data is automatically encrypted or decrypted right before it is loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc).

This has to be the best encryption freeware to ever come out. It's simply brilliant! If you overlook the complexity and all the big confusing words, you'll see, once installed, that its probably the most easiest to use software ever invented.

All you have to do is make a new blank file on your hard disk which the wizard will do for you, then mount the drive using your password and a new drive will appear in My Computer. If you log off or switch user or shut down, Truecrypt automatically unmounts your private files. Of all the years I've used it, it seems to be perfectly error free, you can never go wrong with it.

The interface might not look like the best thing in the world but it has many features which include military grade encryption algorithms that will protect your data even from hackers and other handy encryption tools.

Truecrypt tops all other freeware encryption programs because of its reliability and flexibility.The program is small so you can transfer your encrypted files to work places and use them there with full security. Truecrypt deploys two inventive ways to protect your files, you can either use a password or a key, a password hidden in a separate file, and the file is the key to opening your encrypted files.

Truecrypt is a definite must have if you are a office worker or simply want to protect your work from a younger brother. A must have.

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The ultimate freeware encryption program, TrueCrypt is loaded with powerful features that those concerned with protecting their data from thievery should want--and have.

It offers 11 algorithms for encrypting your private files in a password-protected volume. You can store your encrypted data in files (containers) or partitions (devices). TrueCrypt works hard to offer powerful data protection, recommending complex passwords, explaining the benefits of hidden volumes, and erasing telltale signs of the encryption process, including mouse movements and keystrokes. Though the interface may not be immediately intuitive, its powerful, on-the-fly encryption for no cost still earns the freeware security tool a top rating.

The useful tips in the extensive help manual and volume-creation wizard provide excellent guidance. In fact, they're required reading, as TrueCrypt lacks any considerable in-program help. For instance, the tutorial explains the entire concept beyond "hidden" volumes, but it doesn't quite explain how to mount them. One obvious downside of any strong encryption program is if you happen to forget your lengthy, secure password, you should consider any protected files as good as gone. However, once files are mounted to a local drive with your password or key, they conveniently behave just like any normal files, allowing you to easily open, copy, delete, or other modify them another way. Dismount the volume, and voila--your previously accessible files are now safely secure from prying eyes.

Users can even create a hidden operating system, encrypted away from nosy busybodies, but make no mistake--TrueCrypt is not for the casual encryption explorer. Be sure to thoroughly understand what you're doing with the program before you do something regrettable.

-from cnet.com