TrueCrypt review
That method offers several advantages. First off, you can "hide" the encrypted volumes, so other users don't even know that they exist. You can also segregate your data files, only encrypting what you deem important. And finally, you do not need to encrypt your application or operating system files, which means the system won't take as much of a performance hit.
TrueCrypt uses several different encryption algorithms, including AES, Serpent and Twofish. Those algorithms can be combined in many different ways to create complex encryption schemes
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