![]() TrueCrypt first attempts to decrypt the standard volume header using the entered password. Whether the hidden or the outer volume will be mounted is determined by the entered password (i.e., when you enter the password for the outer volume, then the outer volume will be mounted when you enter the password for the hidden volume, the hidden volume will be mounted). Then click Mount, and enter the password for the hidden volume. Files that really are sensitive will be stored on the hidden volume.Ī hidden volume can be mounted the same way as a standard TrueCrypt volume: Click Select File or Select Device to select the outer/host volume (important: make sure the volume is not mounted). You will reveal only the password for the outer volume, not for the hidden one. These files will be there for anyone who would force you to hand over the password. To the outer volume, (before creating the hidden volume within it) you should copy some sensitive-looking files that you actually do NOT want to hide. The password for the hidden volume must be substantially different from the password for the outer volume. ![]() Note that TrueCrypt does not modify the file system (information about free space, etc.) within the outer volume in any way. Even when the outer volume is mounted, it should be impossible to prove whether there is a hidden volume within it or not *, because free space on any TrueCrypt volume is always filled with random data when the volume is created † and no part of the (dismounted) hidden volume can be distinguished from random data. The principle is that a TrueCrypt volume is created within another TrueCrypt volume (within the free space on the volume). The layout of a standard TrueCrypt volume before and after a hidden volume was created within it. Using a so-called hidden volume allows you to solve such situations without revealing the password to your volume. There are many situations where you cannot refuse to reveal the password (for example, due to extortion). It may happen that you are forced by somebody to reveal the password to an encrypted volume.
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