[dm-crypt] Encrypted fs in file

Sven Eschenberg sven at whgl.uni-frankfurt.de
Sun Apr 3 18:03:11 CEST 2016

And regarding 1):

You might want to use dd for that and /dev/urandom. (Or use /dev/zero 
and then zero out the inner device before creating the filesystem).



Am 03.04.2016 um 10:41 schrieb Matthias Schniedermeyer:
> On 03.04.2016 00:07, doark at mail.com wrote:
>> Hello,
>> I wanted to make certain that I got this process right since I've never
>> done it before and I can't seem to find docs on the subject.
>> 1. Cat /dev/zero into a new file till it is big enough.
>> 2. Use cryptsetup on the file (format and open).
>> 3. Use mkfs on the loop device.
>> 4. Mount the loop device as if it were a block device.
>> Does this look correct to you?
> Nearly.
> 3) Not the loop device, but the dm-device, the loop it inbetween and is
> handled automatically.
> A symlink for the dm-device appears in /dev/mapper/ with the name you
> provided for the open command.
> Same for 4) You mount the dm-device

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