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From: Milan Broz <gmazyland@gmail.com>
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Date: Wed, 23 Dec 2015 20:39:25 +0100
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Subject: Re: [dm-crypt] Can LUKS be used on a tmpfs?
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To: H McCurdy <hmccurdy@yahoo.com>, "dm-crypt@saout.de" <dm-crypt@saout.de>

On 12/23/2015 08:05 PM, H McCurdy wrote:
> Hi,
> 
> Is it possible to get crypt_init() to use a tmpfs instead of a block
> device or a file?

No, dm-crypt works only over block devices (/dev/ram* are block devices as well).

You can create a file on tmpfs and use that through loopback though
(but this adds another layer there).

Milan