About

Truecrypt is an open-source on-the-fly disk encryption utility for Windows, Mac OS X, and Linux, currently maintained by The TrueCrypt Foundation.

Truecrypt, unlike most other backup utilities, creates a single encrypted virtual drive, which is then mounted. Any files written to the mounted virtual drive are then encrypted and stored in the virtual drive.

It also allows on-the-fly encryption of whole partitions and storage devices, as well as operating systems.

Truecrypt on Windows XP

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