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Date: Sun, 3 Apr 2016 10:41:31 +0200
From: Matthias Schniedermeyer <ms@citd.de>
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Subject: Re: [dm-crypt] Encrypted fs in file
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To: doark@mail.com
Cc: dm-crypt@saout.de

On 03.04.2016 00:07, doark@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




-- 

Matthias