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<p>
<a href="Documentation.html">Documentation</a>
<img src="arrow_right.gif" alt=">>" style="margin-top: 5px">
<a href="Plausible%20Deniability.html">Plausible Deniability</a>
<img src="arrow_right.gif" alt=">>" style="margin-top: 5px">
<a href="Hidden%20Volume.html">Hidden Volume</a>
</p></div>
<div class="wikidoc">
<h1>Hidden Volume</h1>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
It may happen that you are forced by somebody to reveal the password to an encrypted volume. There are many situations where you cannot refuse to reveal the password (for example, due to extortion). Using a so-called hidden volume allows you to solve such situations
without revealing the password to your volume.</div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
<img src="Beginner's Tutorial_Image_024.gif" alt="The layout of a standard VeraCrypt volume before and after a hidden volume was created within it." width="606" height="412"></div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
<em style="text-align:left">The layout of a standard VeraCrypt volume before and after a hidden volume was created within it.</em></div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
<br style="text-align:left">
The principle is that a VeraCrypt volume is created within another VeraCrypt volume (within the free space on the volume). 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 <em style="text-align:left">any </em>VeraCrypt 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. Note that VeraCrypt does not modify the file
+ space on <em style="text-align:left">any </em>VeraCrypt volume is always filled with random data when the volume is created** and no part of the (unmounted) hidden volume can be distinguished from random data. Note that VeraCrypt does not modify the file
system (information about free space, etc.) within the outer volume in any way.</div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
<br style="text-align:left">
The password for the hidden volume must be substantially different from the password for the outer volume. 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.
These files will be there for anyone who would force you to hand over the password. You will reveal only the password for the outer volume, not for the hidden one. Files that really are sensitive will be stored on the hidden volume.</div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
A hidden volume can be mounted the same way as a standard VeraCrypt volume: Click
<em style="text-align:left">Select File</em> or <em style="text-align:left">Select Device
</em>to select the outer/host volume (important: make sure the volume is <em style="text-align:left">
not</em> mounted). Then click <em style="text-align:left">Mount</em>, and enter the password for the hidden volume. 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).</div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
VeraCrypt first attempts to decrypt the standard volume header using the entered password. If it fails, it loads the area of the volume where a hidden volume header can be stored (i.e. bytes 65536&ndash;131071, which contain solely random data when there is
no hidden volume within the volume) to RAM and attempts to decrypt it using the entered password. Note that hidden volume headers cannot be identified, as they appear to consist entirely of random data. If the header is successfully decrypted (for information
on how VeraCrypt determines that it was successfully decrypted, see the section <a href="Encryption%20Scheme.html" style="text-align:left; color:#0080c0; text-decoration:none.html">
Encryption Scheme</a>), the information about the size of the hidden volume is retrieved from the decrypted header (which is still stored in RAM), and the hidden volume is mounted (its size also determines its offset).</div>
<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
A hidden volume can be created within any type of VeraCrypt volume, i.e., within a file-hosted volume or partition/device-hosted volume (requires administrator privileges). To create a hidden VeraCrypt volume, click on
<em style="text-align:left">Create Volume </em>in the main program window and select
<em style="text-align:left">Create a hidden VeraCrypt volume</em>. The Wizard will provide help and all information necessary to successfully create a hidden VeraCrypt volume.</div>