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If you want to mount an outer volume and protect a hidden volume within using cached passwords,
then follow these steps: Hold down the Control (Ctrl) key when clicking Mount (or select Mount with
Options from the Volumes menu). This will open the Mount Options dialog. Enable the option
Protect hidden volume against damage caused by writing to outer volume and leave the password
box empty. Then click OK.
If you need to mount an outer volume and you know that you will not need to save any data to it,
then the most comfortable way of protecting the hidden volume against damage is mounting the
outer volume as read-only (see the section Mount Options).
Security Requirements and Precautions Pertaining to Hidden Volumes
If you use a hidden VeraCrypt volume, you must follow the security requirements and precautions
listed below in this section. Disclaimer: This section is not guaranteed to contain a list of all security
issues and attacks that might adversely affect or limit the ability of VeraCrypt to secure data stored
in a hidden VeraCrypt volume and the ability to provide plausible deniability.
If an adversary has access to a (dismounted) VeraCrypt volume at several points over time, he
may be able to determine which sectors of the volume are changing. If you change the
contents of a hidden volume (e.g., create/copy new files to the hidden volume or
modify/delete/rename/move files stored on the hidden volume, etc.), the contents of sectors
(ciphertext) in the hidden volume area will change. After being given the password to the outer
volume, the adversary might demand an explanation why these sectors changed. Your failure
to provide a plausible explanation might indicate the existence of a hidden volume within the
outer volume.
Note that issues similar to the one described above may also arise, for example, in the
following cases:
o
The file system in which you store a file-hosted VeraCrypt container has been
defragmented and a copy of the VeraCrypt container (or of its fragment) remains in the
free space on the host volume (in the defragmented file system). To prevent this, do
one of the following:
Use a partition/device-hosted VeraCrypt volume instead of file-hosted.
Securely erase free space on the host volume (in the defragmented file system)
after defragmenting. On Windows, this can be done using the Microsoft free
utility SDelete. On Linux, the shred utility from GNU coreutils package can be
used for this purpose.
Do not defragment file systems in which you store VeraCrypt volumes.
o
A file-hosted VeraCrypt container is stored in a journaling file system (such as NTFS).
A copy of the VeraCrypt container (or of its fragment) may remain on the host volume.
To prevent this, do one the following:
Use a partition/device-hosted VeraCrypt volume instead of file-hosted.
Store the container in a non-journaling file system (for example, FAT32).
o
A VeraCrypt volume resides on a device/filesystem that utilizes a wear-leveling
mechanism (e.g. a flash-memory SSD or USB flash drive). A copy of (a fragment of) the
VeraCrypt volume may remain on the device. Therefore, do not store hidden volumes on
such devices/filesystems. For more information on wear-leveling, see the section
Wear-
Leveling in the chapter Security Requirements and Precautions.
o
A VeraCrypt volume resides on a device/filesystem that saves data (or on a
device/filesystem that is controlled or monitored by a system/device that saves data)
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