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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="diskencryption">
<title>Encryption of Disk Images</title>
<body>
<p>
Oracle VM VirtualBox enables you to transparently encrypt the data
stored in hard disk images for the guest. It does not depend on a
specific image format to be used. Images which have the data
encrypted are not portable between Oracle VM VirtualBox and other
virtualization software.
</p>
<p>
Oracle VM VirtualBox uses the AES algorithm in XTS mode and supports
128-bit or 256-bit data encryption keys (DEK). The DEK is stored
encrypted in the medium properties and is decrypted during VM
startup by entering a password which was chosen when the image was
encrypted.
</p>
<p>
Since the DEK is stored as part of the VM configuration file, it
is important that it is kept safe. Losing the DEK means that the
data stored in the disk images is lost irrecoverably. Having
complete and up to date backups of all data related to the VM is
the responsibility of the user.
</p>
</body>
</topic>
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