If you're on the move regularly or your hard drive is accessible by third parties, it's always vulnerable to attack or your privacy can be compromised by prying eyes. One way to prevent such compromises is by encrypting data.TrueCrypt aims to do this by allowing you to encrypt data "on-the-fly". This means that data is automatically encrypted or decrypted immediately before it is loaded or saved without any further action on your part. Nothing can be encrypted or decrypted without using the correct password or encryption keys.
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